Drawing are pictured at the Extinction Rebellion protest site at the Marble Arch in London, Britain April 24, 2019. REUTERS/Toby Melville

Children reach for coloured pencils while attending a class at a camp for displaced people following the earthquake and tsunami in Palu, Central Sulawesi, Indonesia October 8, 2018. REUTERS/Darren Whiteside

A decorated Spanish guitar is seen as folk music guitarists perform during the traditional feast of St Gregory in Marsaxlokk, Malta, April 4, 2018. REUTERS/Darrin Zammit Lupi

Molds for the manufacture of guitars, are displayed inside a workshop of instruments at Vina del Mar, Chile April 4, 2018. REUTERS/Rodrigo Garrido

Wooden chips are seen in the workshop of "Kanzian & Traunsteiner Doublebass Builders" in Vienna, Austria April 4, 2018. REUTERS/Leonhard Foeger

Wood-cased pencils are pictured in the drying oven during pencils production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased coloured pencils are pictured during their production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased coloured pencils are pictured in a shop at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased coloured pencils are pictured in a shop at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased coloured pencils are pictured in a shop at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased pencils are pictured during their production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased pencils are pictured during their production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased pencils are pictured during their production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Wood-cased pencils are pictured during their production at Faber-Castell manufacturer in Stein near Nuremberg, Germany January 16, 2018. Picture taken January 16, 2018. REUTERS/Michaela Rehle

Drawings of balloons in different colours and two languages are seen in a classroom of a refugee deportation registry centre in Manching near Ingolstadt, Germany, February 16, 2016. Picture taken on February 16, 2016. REUTERS/Michaela Rehle

Migrant children colour in a playroom in a refugee camp in Celle, Lower-Saxony, Germany October 15, 2015. With the approach of winter, authorities are scrambling to find warm places to stay for the thousands of refugees streaming into Germany every day. In desperation, they have turned to sports halls, youth hostels and empty office buildings. But as these options dry up, tent cities have become the fall-back plan: despite falling temperatures, a survey by German newspaper Die Welt showed at least 42,000 refugees were still living in tents. Picture taken October 15, 2015. To match Insight EUROPE-MIGRANTS/GERMANY-WINTER REUTERS/Fabian Bimmer TPX IMAGES OF THE DAY

Coloured pencils are seen in a room belonging to Bin Ha-yong, a high school student who died in the Sewol ferry disaster, in Ansan April 7, 2015. His dream was to be an illustrator. Nearly a year after the Sewol ferry sank on April 16, 2014, with the death of 250 students, some families keep their children’s bedrooms intact to remember and honour their loved ones. More than 300 people, most of them students and teachers from Danwon High School, are dead, or missing and presumed dead, after the Sewol ferry sank on a routine trip from the port of Incheon, near Seoul, to the holiday island of Jeju. REUTERS/Kim Hong-Ji

A woman holds a brush, a pen and a pencil in the colours of the French flag during a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in Ottawa January 11, 2015. REUTERS/Chris Wattie (CANADA - Tags: CIVIL UNREST CRIME LAW POLITICS)

A woman holds a sign reading "I am Charlie" and a brush, pen and pencil in the colours of the French flag during a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in Ottawa January 11, 2015. REUTERS/Chris Wattie (CANADA - Tags: CIVIL UNREST CRIME LAW SOCIETY)

A woman holds a sign reading "I am Charlie" and a brush, pen and pencil in the colours of the French flag during a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in Ottawa January 11, 2015. REUTERS/Chris Wattie (CANADA - Tags: CIVIL UNREST CRIME LAW SOCIETY)

A box of 36 coloured pencils as photographed in a studio with an illustrative price tag of $115 (US dollars), equivalent to the Bs. 725 (bolivars) that it costs on average to purchase in Caracas at the official exchange rate of 6.3 bolivars per dollar, in Caracas September 29, 2014. Venezuela's economic crisis has led to some shocking and surreal price distortions that hit people's buying power dramatically. While the government of President Nicolas Maduro calls the country's minimum wage of Bs. 4,252 the highest in the region when converted to $675 using the official exchange rate, the galloping black market for currency considers it as just $42.50 when converted at the street rate of Bs. 100 per US dollar, the rate which many importers and retail outlets must use to acquire hard currency. Venezuela's annual inflation rate of more than 63 percent is the highest in the Americas, according to official statistics. Picture taken September 29, 2014. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: BUSINESS POLITICS TPX IMAGES OF THE DAY)

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An image of the Statue of Liberty is pictured though a rain covered taxi window in New York April 15, 2014. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY TPX IMAGES OF THE DAY)

A Palestinian bride has her hand decorated with a traditional henna design in Khan Younis in the southern Gaza Strip November 27, 2013. REUTERS/Ibraheem Abu Mustafa (GAZA - Tags: SOCIETY)

Children play with colouring pencils at Il Giardino di Madre Teresa, a nursery school managed by the association Kala Onlus and where some students are the children of migrants, in Palermo May 29, 2013. Italy's Integration Minister Cecile Kyenge, who was born in Democratic Republic of Congo and came to Italy when she was 18, has fuelled a debate about citizenship laws that many immigrants say prevent them from fully integrating into society and mean that even children born in Italy cannot gain citizenship until they turn 18. Picture taken May 29, 2013. REUTERS/Tony Gentile (ITALY - Tags: POLITICS SOCIETY IMMIGRATION)

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A logo is painted on the street by protesters against France's planned legalisation of same-sex marriage in Paris, April 17, 2013. French deputies start the second reading of a bill which would legalise gay marriage and give gay couples adoption rights. REUTERS/Benoit Tessier (FRANCE - Tags: SOCIETY POLITICS)

Indian artist Salim Sheikh displays his artwork, the date 1-1-2013 carved onto the tips of coloured pencils, inside his workshop in western Indian city of Ahmedabad Decemeber 31, 2012. REUTERS/Amit Dave (INDIA - Tags: SOCIETY ANNIVERSARY)

A customer has her hands decorated with a henna design, a popular tradition in the Gulf, as Muslims prepare to celebrate Eid al-Fitr in Dubai, August 17, 2012. Eid-al-Fitr marks the end of Ramadan, the holiest month in the Islamic calendar and is scheduled to be celebrated in Saudi Arabia and the United Arab Emirates on August 20. REUTERS/Jumana El Heloueh (UNITED ARAB EMIRATES - Tags: RELIGION SOCIETY)

Nisrine, a henna artist, decorates a customer's feet with a henna design, a popular tradition in the Gulf, as Muslims prepare to celebrate Eid al-Fitr in Dubai, August 17, 2012. Eid-al-Fitr marks the end of Ramadan, the holiest month in the Islamic calendar and is scheduled to be celebrated in Saudi Arabia and the United Arab Emirates on August 20. REUTERS/Jumana ElHeloueh (UNITED ARAB EMIRATES - Tags: RELIGION SOCIETY)

School children dressed as Lord Krishna (L) and Goddess Radha sit in their classroom during the celebrations on the eve of the Hindu festival "Janmashtami" in Jammu August 9, 2012. Janmashtami, which marks the birth of Lord Krishna, will be celebrated across the country on Friday. REUTERS/Mukesh Gupta (INDIAN-ADMINISTERED KASHMIR - Tags: RELIGION SOCIETY)

Coloured pencils are pictured in a wooden box at a nursery school in Eichenau near Munich June 18, 2012. REUTERS/Michaela Rehle (GERMANY - Tags: EDUCATION SOCIETY)

Coloured pencils are pictured in a wooden box at a nursery school in Eichenau near Munich June 18, 2012. REUTERS/Michaela Rehle (GERMANY - Tags: EDUCATION SOCIETY)

Colour pencils are pictured as children draw at a nursery school in Eichenau near Munich June 18, 2012. German Chancellor Angela Merkel is looking to establish a childcare allowance for stay-at-home mothers. The draft law, known as Betreuungsgeld, will provide mothers who stay at home with their children, about 150 Euros ($190) per month. Picture taken 18, 2012. REUTERS/Michaela Rehle (GERMANY - Tags: EDUCATION POLITICS)

Pencils and pencil shavings are seen on a desk at Watlington Primary School in Watlington, southern England December 14, 2011. On Thursday the Department of Education will publish primary school league tables. REUTERS/Eddie Keogh (BRITAIN - Tags: POLITICS EDUCATION)

Bullet casings and coloured pencils are seen at a workshop of an association named "Our Children Are With Rebels" in Misrata June 1, 2011. REUTERS/Zohra Bensemra (LIBYA - Tags: POLITICS CONFLICT MILITARY SOCIETY)

The logo of an electric car is painted on the road during the opening ceremony of the first Latin American public charging station, at Santiago, April 20, 2011. REUTERS/Ivan Alvarado (CHILE - Tags: ENVIRONMENT SPORT MOTOR RACING ENERGY BUSINESS)

A poster illustration of a soldier and his rifle hangs behind an arrangement of poppies marking Poppy Day or Remembrance Day, when people commemorate the sacrifices of members of the armed forces and of civilians in times of war, at the war memorial in Colombo November 14, 2010. REUTERS/Dinuka Liyanawatte (SRI LANKA - Tags: CONFLICT MILITARY ANNIVERSARY IMAGES OF THE DAY)

Pencils in the colours of the Italian flag with the head of Pinocchio are displayed for sale in Rome July 23, 2010.
REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY)

Pencils in the colours of the Italian flag with the head of Pinocchio are displayed for sale in Rome July 23, 2010.
REUTERS/Alessandro Bianchi (ITALY - Tags: SOCIETY)

AC Milan supporters shout during a protest against the sale of soccer player Kaka in front of the club's headquarters in downtown Milan, January 19, 2009. Media reports have said English Premier League club Manchester City, the richest club in the world after their takeover by Abu Dhabi United Group, have bid 110 million euros ($146 million) for the 26-year-old Kaka. REUTERS/Stefano Rellandini (ITALY)

A volcano eruption victim draws inside a shelter at Castro town, some 1191 km (740 miles) south of Santiago, May 5, 2008. Chile prepared to evacuate another town in its remote Patagonian south on Monday, as ash spewed from a snowcapped volcano for a fourth day after its first eruption in thousands of years. REUTERS/Ivan Alvarado (CHILE)

Bridget Reed creates a chalk drawing of Harry Potter on a sidewalk in Harvard Square, nicknamed "Hogwarts Square" for the night, to celebrate the release of the final book in the Harry Potter series "Harry Potter and the Deathly Hallows" in Cambridge, Massachusetts July 20, 2007. REUTERS/Brian Snyder (UNITED STATES)

Chinese Shaolin monks perform during a world tour in Prague May 29, 2007. The Monks illustrated Kung Fu and Tai-chi exercises in their art program. REUTERS/Petr Josek (CZECH REPUBLIC)

Americo (R) and Almeida compress a mix of colour leads in a roller at the Viarco factory in Sao Joao da Madeira, northern Portugal April 16, 2007. Viarco, a century-old pencil factory in Portugal, struggling to keep up with today's needs, says it has invented a new type of paint from the graphite used in pencils that may change the way artists work. Picture taken April 16. REUTERS/Nacho Doce (PORTUGAL)

Americo Santos compresses a mix of colour leads in a roller at the Viarco factory in Sao Joao da Madeira, northern Portugal April 16, 2007 . Viarco, a century-old pencil factory in Portugal, struggling to keep up with today's needs, says it has invented a new type of paint from the graphite used in pencils that may change the way artists work. Picture taken April 16. REUTERS/Nacho Doce (PORTUGAL)

Colour pencils are seen at the Viarco factory in Sao Joao da Madeira, northern Portugal April 10, 2007. Viarco, a century-old pencil factory in Portugal, struggling to keep up with today's needs, says it has invented a new type of paint from the graphite used in pencils that may change the way artists work. Picture taken April 10. REUTERS/Nacho Doce (PORTUGAL)

Colour pencils are seen as workers polish them with acetone at the Viarco factory in Sao Joao da Madeira, northern Portugal April 10, 2007. Viarco, a century-old pencil factory in Portugal, struggling to keep up with today's needs, says it has invented a new type of paint from the graphite used in pencils that may change the way artists work. Picture taken April 10. REUTERS/Nacho Doce (PORTUGAL)

An image of a town crier is projected on the Arco de Santa Maria of Burgos during a light show to celebrate the 800 anniversary of 'Cantar de Mio Cid' in the northern Spanish town of Burgos March 31, 2007. REUTERS/Felix Ordonez (SPAIN)

Cancer-affected children attend the Rose Day function organised by the Cancer Patients Aids Association (CPAA) at a hospital in Mumbai September 22, 2006. Rose Day, observed to raise public awareness about cancer, involves greeting each of Mumbai's cancer patients with a rose and funds raised from the campaign are used for projects at cancer hospitals. REUTERS/Punit Paranjpe (INDIA)

A tsunami survivor decorates the entrance of her house in a fishing village of Akkarapettai in Nagapattinam, about 325km (202 miles) from the southern Indian city of Chennai December 24, 2005. Government and multilateral agencies have pledged more than $7.3 billion in aid for nations hit by the December 26, 2004 earthquake and tsunami in the Indian Ocean, while global private donations have amounted to more than $5.7 billion. REUTERS/Parth Sanyal

A woman paints a classical view of Rome outside the Sant'Angelo castle in downtown Rome October 25, 2005. REUTERS/Max Rossi Pictures of the month October 2005