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Align four color transparencies, each one a single color (cyan, magenta, yellow, and black), and see a beautiful full color image.

1 cent - $1 per student Ages 6 - 14 Under 5 minutes
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In this activity, learners construct a device that projects images onto a surface, so they can trace landscapes and other sights.

$10 - $20 per student Ages 8 - 14 1 to 2 hours