⌂
⚲
?
✕︎
clip:89518
clip:89518
clip:89518
clip:89518
clip:89518
clip:89518
clip:89518
clip:89518
clip:89518
hi
{"x":0,"y":0} to {"x":0,"y":0}
Copyright © details on Wikimedia Commons.
TU-Dortmund-Mensa-Mathetower-2013.jpg
▦