Algodoo

Okay, so I looked at the outside and inside rims. Ummmm... so, what am I supposed to see? They are spinning. Sure, but I think there's supposed to be something else going on, right? You need to add more description so that people will understand what it is that they are supposed to see.

You are supposed to look close to think if both rims are faster or slower

Great! Now I know what to look for. You should place descriptions like your last comment in the optical illusion scenes so that people will know what they are supposed to be seeing. Just because YOU know what the illusion is about, doesn't mean that everyone else is supposed to know what it is.

Just a friendly suggestion.

okeh