Place the radiometer in direct sunlight and the blades will rotate continuously, demonstrating the conversion of light into motion. This compact, eyecatching piece combines simple function with decorative appeal. Key benefits Visual and calming motion that enhances any desk, shelf, or windowsill. Demonstrates basic principles of light and motion, useful for informal learning and conversation. Simple to use and maintain; powered by sunlight so no external power source is required. Attractive gift idea for friends or family who appreciate unique home or office items. Product highlights Function: Blades rotate when exposed to sufficient light; rotation speed varies with light intensity. Compatibility: Designed for use in direct sunlight or under strong indoor lighting near windows. Size and placement: Compact and lightweight for easy placement on desks, shelves, or tables. Construction: Finished components offer a neat appearance suitable for home or office settings. Performance: Stable operation in adequate light with continuous, smooth blade movement. Use scenarios Office desk: Place on a work desk or windowsill to add a subtle moving focal point and spark conversation with visitors. Living room or entryway: Use as a decorative accent that attracts attention and adds dynamic movement to the room. Educational demonstration: Show students or curious guests how light intensity affects rotation, ideal for casual science demonstrations. This radiometer is a practical, attractive addition for anyone looking to add motion and interest to indoor spaces or to give a thoughtful, easytouse gift.