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Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

1 cent - $1 per student Ages 4 - adult 5 to 10 minutes
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This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

1 cent - $1 per student Ages 4 - adult Under 5 minutes
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In this activity, learners use chemistry to produce weathered "antiqued" paper with burned edges. Learners first soak white paper in coffee and then apply a charring solution of ammonium chloride.

$10 - $20 per student Ages 8 - adult 2 to 4 hours