From you link: > You would not be able to tie a shoe in four dimensional space. I'm not convinced. The thing is that if you tie your shoes with bows at the en

From you link: > You would not be able to tie a shoe in four dimensional space. I'm not convinced. The thing is that if you tie your shoes with bows at the end, those bows are knot-theoretically trivial, even in 3d-space. Still a nice proof!