In this classic demonstration, caustics in a shallow wave tank illustrate the constructive interference of waves passing through a double slit.

By Gabriel Bershenyi, Trevor Beatty, Zachary Brunson, and Jennifer Milliken for Spring 2013 Team Second.
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In this classic demonstration, caustics in a shallow wave tank illustrate the constructive interference of waves passing through a double slit.

A vortex from a ‘cannon’ sheds smoke in its wake.

A 0.5 m diameter soap bubble immediately after formation is not spherical.

The front surface of a bubble reflects surroundings, while the back surface reflects and inverts the surroundings.

A large bubble in the process of bursting!

Bubbles that are large enough wobble as disturbance forces are easily larger than the restoring surface tension.

An air-filled bubble is buoyant above a cold CO2-water fog.

A bubble being blown hangs from a wand above a previously formed bubble.

Light interference shows minute variations in the thickness of a soap bubble skin.

Dyed water beneath vegetable oil was sheared by a moving obstruction, resulting in a Kelvin-Helmholtz instability.