To see how the amount of light changes the shape of our eyes
1. Ask the young people in your group to look at their eyes in a mirror, somewhere where there is a lot of light. Ask them to take note of the size of each pupil, which is the black dot in the center of each eye.
2. Next, ask them to cup their hands around their eyes to cast a shadow over them. Ask them to keep their hands over their eyes for a while to let the pupils adapt to the change in light;
3. They should see their pupils becoming slightly larger. Now ask them to take their hands away. Can they see their pupils shrinking? Whereas humans’ pupils are circular, cats’ pupils are slits. Being able to reduce the pupils to slits rather than tiny circles gives the cat greater control of how much light enters their eyes
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