While not technically infinitely regressive, this photo of crystal champagne flutes reminded me of the effect created by stacking mirrors.
These Polish leaded-crystal champagne flutes came from the Japanese discount store Daiso. At $1.50 each they were an absolute steal. The lead in the crystal makes these flutes stronger and more reflective than glass champagne flutes. You can see the effect the lead has on the glasses through the structured light refractions in this image.