Moving Day Beaver
On May 7th MIT gathered to celebrate the 100 year anniversary of it's move across the river. The day was filled with a procession across the river, a pageant in Killian Court, fireworks, and dance parties in the evening. Throughout the day, visitors, students and others also helped Tim cross the river of lobby 10.
An origami Tim the beaver was suspended above Lobby 10, aboard an origami boat.
On the second floor of lobby 10, instructions said "Help MIT move! Help Tim cross lobby 10! (Turn the spool and make sure Tim doesn't crash into either end of lobby 10)."
The two spools could be pulled to make Tim move back and forth across the lobby.
A video of the contraption in-action can be found here.