Here is a picture of Peter Sagan accidentally winning the opening stage of Three Days of De Panne.
I'm curious why the spokes all appear to be curved here, and particularly why they are all curved away from the ground-contact point.
I think the major variables are:
a) camera shutter
b) wheel rotation
c) forward motion
The spoke lined up with the ground has the least total velocity (angular+linear), which probably accounts for its being the point of visual symmetry here.
But I'd love to better understand what's going on here.