Bubble Film in a Cube
Flat films form surprising interior shapes.
Teaching & key ideas
What you do: Dip cube frame in solution.
What students see: Flat films form surprising interior shapes.
Why it works: Surface tension minimizes surface area while satisfying the frame boundaries.
Question to ask: Why don't the films simply copy the cube walls?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why don't the films simply copy the cube walls?