Why the world gets dark so fast outside the circle of the campfire.
Seeing is a cooperative effort involving your eyes and your brain.
Images of images of images can appear to repeat forever.
Use gelatin as a smoked lens, to view total internal reflection, and as a color filter.
Pencil, pin, paper = phonograph.
Without a boundary, it's hard to distinguish different shades of gray.
Why is the sky blue? That's a sticky question.
Prove to yourself that Galileo was right!
Your experience of the world influences what you see.
Substitute coins for radiation.
Now you see it; now you don't. An object without a sharp edge can fade from your view.
Make it stick.
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