Persistence-of-Vision LED Wand
Letters/patterns appear suspended in space.
Teaching & key ideas
What you do: Move blinking lights quickly in dim room.
What students see: Letters/patterns appear suspended in space.
Why it works: The visual system integrates rapidly changing light positions over short times.
Question to ask: Are the letters really floating in the air?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Are the letters really floating in the air?