Einstein's Alive

PIRA: 6J10.10

Brief Overview

The hollow face illusion is a powerful visual phenomenon where a concave mask appears convex due to our brain’s strong expectation that faces protrude outward. This bias can override actual depth cues such as shadows and binocular vision. Our brains assume faces are convex, an expectation built from experience. When a concave mask is illuminated, the brain misinterprets the lighting as if it were a typical convex face, leading to the illusion.

Materials Required

• Einstein Alive PVC box
• Black fabric Sleeve
• Light bulb (if pvc box doesn't have one attached)
• Extension Cord (Optional with Switch)
• Lazy Susan/rotating platform

Set-up Instructions

Connect the extension cord to the Bulb and adjust the cord so that the cord will enter from the front.

Place the ¾ Cubed Hood over the back of the pvc box, (ensure the mask is visible). 

Position the pvc box at a proper position for observers to get the best view

View the mask with one eye (monocular vision) for a stronger effect. 

How to Perform the Demonstration

1. Show the mask to participants and ask them what they perceive.
2. Gradually adjust lighting and viewing angles to enhance the illusion.
3. Ask them to compare their perception when viewing the mask with both eyes versus one eye.
4. Explain how the brain overrides depth cues due to expectations.

Safety

• If using electronic lighting, ensure cords are secured to prevent tripping.
• Ensure proper grounding to reduce risk of electric shock.
• Handle fragile masks and light bulbs carefully to avoid damage.