Materials for pictures that change with the direction of sunlight What materials can be used to make pictures / paintings, where the colors change as the direction of the sun and hence the angle of incidence of the sun rays hitting the art structure changes? I'm interested in both indoor and outdoor structures and materials.
I was thinking of cardboard-or-similar material placed as vertically running painted wedges, but I'm not sure if that would work.
I think what you are looking for are called “chameleon paints”, but I cannot recommend you use cardboard. It is better to suited to non-flexible surfaces.

Check out chameleon car paint or search on amazon for it. Most automotive shops should stock it.

Another option might be to look for iridescent paints, but they just get a bit shinier depending on the angle that light bounces off the surface into your eye.