User login


Bird in the Cage


Source Institutions

    The Exploratorium

Add to listGo to activity
Bird in the Cage

In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired. Learners will stare at a simple red shape, such as a bird, glued onto white poster board and then quickly stare at an image of a birdcage. Learners will be surprised to see a bluish-green (cyan) bird in the cage. Learners repeat the process with a green bird and a blue bird to discover what color images appear when their eyes become fatigued.

Quick Guide


Preparation Time:
10 to 30 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per student

Age Range:
Ages 6 - 14

Resource Type:
Activity

Language:
English

Materials List (per student)


  • 4 white posterboards or pieces of paper
  • Bright red, green, and blue construction or contact paper
  • Small piece of black construction or contact paper, or black marking pen
  • Scissors
  • Glue or glue stick (if you are using construction paper)
  • Adult help

Subjects


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

Audience


To use this activity, learners need to:

  • see
  • see color

Learning styles supported:

  • Involves hands-on or lab activities

Other


This resource is part of:

Access Rights:

  • Free access

By:

Rights:

  • All Rights Reserved, The Exploratorium,

Funding Sources:

  • National Science Foundation
  • California Department of Education
  • NEC Foundation of America

Share


User Lists


This resource is part of these lists: