3D MODELS: Most of them objects for in a game

While I was studying International Game Architecture and Design I have created a couple of 3D modals,
which are used in the project game called: Mayhem It is a race game where you can drive along a track with each other.
The main goal is to push each other of the track or into an obstacle, that's the only opportunity to win the race.
I also made an Escher project (the last picture) in 3D which shows an optical illusion, you can't see it from this render angle but it is a distorted model.