The monsters page now has the real 3D models from the game. Drag them round. Look at Hungry's fork. Look at the back of the Hymotyzer, which you should never do in the game.
Each one started as one of Benjamin's drawings. Then it became artwork, then a 3D model, then it got a skeleton so it could move.
Not every step worked first time. A picture that looks great can still make a terrible 3D model, so some monsters took a few goes. The AI makes the first version. Benjamin decides if it's right.
The full story, step by step, is on the How it's made page.