Incredible Shrinking & Growing Head It's an unbelievable optical illusion! email to friend
print this page

You have to see this illusion to believe it... your head actually looks like it's inflating like a balloon! The audience is instructed to stare at the large, spinning disk - it's 38 cm (15 in) in diameter. It's almost hypnotic as the spinning spiral pulls you into the illusion. All of a sudden the presenter says, "Look at my nose!" To everyone's amazement, the presenter's head appears to grow - like a balloon being inflated. It's an amazing optical illusion that will instantly become one of your favorite science demos. This version comes complete with the specially printed disk and a battery operated motor. Recommended for children ages 10 and up (for demonstration).

What's included?

• Special spiral disk
• Cordless, battery operated screwdriver
• Screwdriver adaptor and screw
• Activity guide

What does it teach?

This amazing demonstration is a great introduction to the science of optical illusions.