Heather Dart trains on the silks at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Performers train at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 22, 2016. Picture taken September 22, 2016. REUTERS/Jim Young 

Jeff Kirschner practices on the silks at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Ivy Blake balances a cup on her head as she trains at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Jeff Kirschner (R) watches instructor Hayley Larson practice on the silks at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Sergio Leor (R) teaches a class on the slacks at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 19, 2016. Picture taken September 19, 2016. REUTERS/Jim Young 

Tana "Tank" Kara balances a parasol on her feet as she practices her foot juggling at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Performers train at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 23, 2016. Picture taken September 23, 2016. REUTERS/Jim Young 

Aerial Emery trains on the cyr wheel at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY

Jessi Rae practices on the sling at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 22, 2016. Picture taken September 22, 2016. REUTERS/Jim Young 

Molly Plunk trains on the tightrope wire at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

Laura Torres is reflected in a mirror as she practices on the tightrope at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 19, 2016. Picture taken September 19, 2016. REUTERS/Jim Young 

Julie Marshall trains on the aerial hoop at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 22, 2016. Picture taken September 22, 2016. REUTERS/Jim Young 

Adams Marris (L) and Jon Snyder balance on the bar at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 23, 2016. Picture taken September 23, 2016. REUTERS/Jim Young 

Lucas Aguirre practices his juggling at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 22, 2016. Picture taken September 22, 2016. REUTERS/Jim Young 

Mary Pat Letourneau trains on the silks at the Aloft Loft circus training and teaching school which was converted from a church, in Chicago, Illinois, U.S., September 22, 2016. Picture taken September 22, 2016. REUTERS/Jim Young 

Johanna Vargas trains on the corde lisse at the Aloft Loft circus training and teaching school, which was converted from a church, in Chicago, Illinois, September 20, 2016. Picture taken September 20, 2016. REUTERS/Jim Young 

The Chicago skyline is seen beyond the arctic sea smoke rising off Lake Michigan in Chicago, Illinois, January 6, 2014. A blast of Arctic air gripped the mid-section of the United States on Monday, bringing the coldest temperatures in two decades, forcing businesses and schools to close and causing widespread airline delays and hazardous driving conditions. Meteorologists said temperatures were dangerously cold and life-threatening in some places, with 0 degrees Fahrenheit (minus 18 Celsius) recorded in Chicago, St. Louis and Indianapolis. The chill was set to bear down on eastern and southern states as the day wore on. REUTERS/Jim Young (UNITED STATES - Tags: ENVIRONMENT CITYSCAPE TPX IMAGES OF THE DAY) 

Edward Palta, 6, the son of an immigrant mother, peers into a bathroom while being looked after during a school inservice day by Elvira Arellano in her apartment inside Adalberto United Methodist Church in Chicago April 18, 2007. April 15 marked the eighth month that the Mexican-born Arellano, 32, has been fighting a deportation order from inside the Chicago church where she has imprisoned herself, invoking the ancient medieval protection of sanctuary. REUTERS/John Gress (UNITED STATES) 

Icicles dangle from a cable on North Avenue Pier near Chicago's downtown as the temperatures in the city plunged below zero degrees January 17. Schools were closed for the second straight day, as a result of the weather conditions.