I don't know how to "explain" intuition, but usually I imagine not myself but some kind of geometric shape in front of a mirror (say a square with the edges lab

I don't know how to "explain" intuition, but usually I imagine not myself but some kind of geometric shape in front of a mirror (say a square with the edges labelled). If I try to visualize how light bounces, it is intuitive that in a mirror I'm seeing the light bouncing from mirror -> me in the proper way and in a photo, I'm looking at the shape directly with a camera (I'm where the mirror was).