I cant help but to think of it as more the rock “falling” forward, as opposed to walking.

Mabey it should be called the “magie Simpson” effect.

It’s the same way you dig you’re car out of a bog, if you get stuck. Dig a hole infront of the tyre, so you’re going “downhill”.

Cheers. and all the best from Australia.

(in central australia, we get rock that are very round, they are made of many layers of clay, and the small rocks roll on the flat desert, and over a long period build up in size.

(I think they are locally called ‘devils marbels”).