Avoiding right angles is a big part of it, because bouncing off surfaces that meet at right angles means the signal gets bounced back in the direction it came from, perfect for radar. That’s how many cats’ eye reflectors work and that’s why they shine so brightly in your headlights at night.
If you ever go in a room with two mirrors that meet at a right angle, notice how you can see a reflection of yourself right in the corner, wherever you are in the room. It’s simple geometry.
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