Experiment Bioroid! - a robot controlled toy for small creatures like rats, hamsters, guinea pigs, lizards, or other small pets. The creature is located under the transparent shield, the clear hemisphere, on the yellow circle. The hemisphere is connected to the base by neodymium magnets.
The yellow circle is a pressure sensitive surface. By using three omni-directional wheels, the robot moves in the same direction as the animal. Experiment Bioroid! is like a vehicle for pets.
For safety, the robot has infrared sensors that stop the toy when it is close to an obstacle. To resume movement, the pet must start walking in another direction. The toy also stops when the creature is in the center of the yellow circle.
This turned out great! I'm glad to see you got it all the way to a working prototype. You get two thumbs up for adding the proximity sensors to the outside too (It's the humane thing to do ;-) )