Glider gluon demonstration
Another demonstration shows how a bouncing glider may shuttle between two obstacles - still lifes - drawing them ever closer together. Just as the glider is about to be crushed, the walls coalesce but the glider escapes to one side, seeking new walls to conquer. Multiple gliders may go about their business, competing for the wall if they lie on opposite sides or hastening to squeeze if they lie on the same side.
Harold V. McIntosh