Shrinking Spot

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In this activity, learners control the (apparent) size of a hole with their brain. This illusion occurs due to an automatic reflex that causes light entering one eye to change what is seen in the other eye, demonstrating one of the many idiosyncrasies of the human visual system. Activity includes step-by-step instructions, and an explanation of the science behind the activity.

Quick Guide

Preparation Time:
Under 5 minutes
Learning Time:
5 to 10 minutes
Estimated Materials Cost:
1 cent - $1 per student
Age Range:
Ages 11 - 18
Resource Type:
Activity
Language:
English

Materials List (per student)

  • 2 1/2 x 4 1/2 inch (6 x 11 cm) rectangle of black card stock or construction paper
  • Tape
  • One 2 x 2 inch (5 x 5 cm) square of aluminum foil
  • Pushpin

Keywords

Subjects

  • Life Sciences
    • Human Senses and Perception
      • Vision
      • Perception
  • Physical Sciences
    • Vibration and Waves
      • Light and Optics
    • Light and Optics
      • Sunlight and Color

Other

Includes alignment to state and/or national standards:

This resource is part of:

Access Rights:

  • Free access

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