PURPOSE: Demonstrate an impossible figure in a dramatic way.
DESCRIPTION: The walk-in box is set up on one side of the lecture hall (or classroom) and viewed by a TV camera on the opposite side, with the view by the TV camera shown on the rear TV screen above the blackboards in the lecture hall (or on a monitor in the classroom). Students watch as the instructor "walks into" the box. A spotlight is used to illuminate the box while using the TV projector.
REFERENCES: (PIRA unknown.) See Demonstration Reference File for interesting descriptions of this apparatus, how to build it, how to present it, and some variations.
EQUIPMENT: Walk-in box with TV camera, Fresnel spotlight.
SETUP TIME: 5 min.
Go back to Lecture-Demonstration Home Page.