Persistence-of-Vision LED Wand

Letters/patterns appear suspended in space. Ask students to predict what will happen. Move blinking lights quickly in dim room. Key idea: The visual system integrates rapidly changing light positions over short times. Ask: Are the letters really floating in the air? Safety and cleanup: Dim room; no strobe use for photosensitive students if rapid flashing. https://www.google.com/search?q=%22Persistence-of-Vision+LED+Wand%22+science+demonstration+experiment