pull a long bar out of a soap solution reservoir along guide wires,
creating a large soap film 5 feet square. Beautiful interference
colors are observed as the film flows and thins out, eventually
becoming black due to destructive interference. Blowing on the bubble
sheet can set up interesting flow patterns or distort the film into
interesting reflective shapes. Shaking the frame of the exhibit
can excite various resonant standing waves. This exhibit also demonstrates
nonlinear behavoir through its cascading fractal patterns of color.