ForumNew Official Cube found in a Portal 2 Educational walkthrough
FileConservation of Momentum Using New Portal 2 Educational Objects|thumb|center|356px
As it seems, this is an official cube Valve made for the http//www.teachwithportals.com/ "Teach With Portals" initiative.
You can found more information here
I hope they release this cube for the retail version.^w^
--UserOrahi-Wii|Orahi-Wii (User talkOrahi-Wii|talk) 1550, November 11, 2012 (UTC)