A related note is the reverse steering bike which is impossible to stay up on unless you 'relearn' how to ride a bike. http://www.youtube.com/watch?v=9gCnBBeV2

A related note is the reverse steering bike which is impossible to stay up on unless you 'relearn' how to ride a bike. http://www.youtube.com/watch?v=9gCnBBeV2ws&feature=related http://www.youtube.com/watch?v=9gCnBBeV2ws&feature=relat... I think that proves things a bit better - we stay up on a bike because we learn to notice any slight chance we're falling, and counteract that with steering to bring us back to upright.