These are pictures from pre-movie events at Electric Theater. This event is also reported at Engadget. After entering the gate, SIGGRAPH staff were distributing stick type tags with red and green film on it. Two cameras are capturing from the screen, and they recognize the positions of audiences. Those huge games were basically done by two teams: Left group and Right group. e.g. Left group is responsible to move the cursor horizontal way (left=green,right=red) and Right group is responsible to move vertical way to draw some sketches.