Any two waves can combine and interfere with each other. If they add the result is a bigger wave. This is called CONSTRUCTIVE INTERFERENCE. If they combine and cancel it's called DESTRUCTIVE INTERFERENCE.

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Area Sign - Mixing Waves
Blue Sky
Bridge Light
Bubble Graphics Board
Bubble Suspension
Bubble Tray
Chain Interference Analogy
Coated Optics
Dichroic Clock
Distilled Light
Does Your Back Curve?
Hologram - Skull
Interference Patterns
Laser Demonstration
Leyes Photos
Lissajous Patterns
Long Path Diffraction
Michelson Interferometer
Moire Patterns
Multiple Raccoon Eyes
Picket Fence Beats
Points of Light
Rotating Light
Soap Bubbles
Soap Film Painting
Tone Memory
Unsung Voices
Walking Beats
Watch Dog
Water Waves
Wave Upon Wave

Beats - Spatial
Beats - Temporal
Holograms / Holography
Moire Patterns
Thin Films

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