Experimenting in an attempt to construct a two-motor biped, young humanoid stumbled upon this idea. The motors, connected to the central frame with gears, moved in an ellipse. As they moved up, they would supposedly push a beam that tilted the NXT Intelligent Brick on top over the other leg. The center of gravity would thus be shifted, allowing the leg to continue to move up off the ground and step forward. Unfortunately, the weight shifting mechanism did not work, and the idea was abandoned.
