At a certain distance from the Giant Mirror, light bounces off of you and the curved mirror and focuses at a point between the two—making your reflection appear 3D (and upside-down). From about 9 feet away, approach the mirror with your hand outstretched, and give yourself a high-five. How does it feel to shake hands with your reflection?
Photo by Gayle Laird
© Exploratorium, www.exploratorium.edu