Drop IT!: Depth Perception

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These two activities (4th on the page) demonstrate the importance of two eyes in judging depth. In the first activity, two learners compare the accuracy of dropping objects into a cup using only one eye or both eyes. In the second activity (a game), learners test the accuracy of dropping a marker onto a target using only one eye or both eyes. These activities can be used separately or in conjunction to illustrate how depth perception affects our ability to complete tasks.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
5 to 10 minutes

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 8 - 18

Resource Types:
Activity, Demonstration, Experiment/Lab Activity, Game


Materials List (per student)

  • Cup (yogurt cup or drinking cup)
  • Drop objects (pennies, buttons, paper clips, clothes pins)
  • Paper for target
  • Markers (two colors)


  • Life Sciences
    • Human Body
      • The Brain and Nervous System
    • Human Senses and Perception
      • Vision
      • Perception
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations

Informal Categories

  • Games


To use this activity, learners need to:

  • see
  • touch

Learning styles supported:

  • Involves teamwork and communication skills
  • Involves hands-on or lab activities


This resource is part of:

Access Rights:

  • Free access


  • Chudler, Ph.D., Eric H.


  • All rights reserved, Eric H. Chudler, 2009