On Apr 7, 2006, at 8:06 AM, Ryan K. Brooks wrote:

Kostas Kavoussanakis wrote:

How do the tyres climb up the ramp?

The viewer doesn't actually know what is "up". "Up" doesn't have to be perpendicular to the floor.

True, but that would make other bits of the interaction very difficult to accomplish. The tires were weighted inside, as explained in several of the URLs posted already.

Godfrey

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