• Caption: Multicolored playpen balls cascade out of a ceiling hatch and onto the audience during the xkcd / Randall Munroe lecture in MIT's lecture hall 10-250.
  • Keywords: cyca
  • File Name: TT2_0453.NEF
  • Image Date: 5/14/07 7:14:19 PM EDT
  • Aperture: ƒ/2.8
  • Shutter Speed: 1/80
  • Focal Length: 17.0mm