Thread the Needle: Using Two Eyes Gives You Depth Perception

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Closing one eye eliminates one of the clues that your brain uses to judge depth. Trying to perform a simple task with one eye closed demonstrates how much you rely on your depth perception. In this activity, learners compare their ability to perform simple tasks with one eye versus with two eyes.

Quick Guide

Learning Time:

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 6 - 14

Resource Type:


Materials List (per student)

  • A dowel or pencil
  • A washer with a hole that's a little larger than the dowel's diameter
  • A lump of modeling clay about the size of your thumb


  • Life Sciences
    • Human Senses and Perception
      • Vision
      • Perception


To use this activity, learners need to:

  • see
  • be mobile
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


This resource is part of:

Access Rights:

  • Free access