This popular soothing visual display from Toysmith requires no power or mechanical parts and can provide hours of entertainment and visual relaxation. The Liquid Motion Bubbler presents the phenomena of liquid dynamics in a fun and soothing display that you control. Flip it like an hourglass and watch the colorful liquid elements inside squeeze, slip, and float serenely to the bottom. Each bubble motion tumbler includes 2 vibrant hues. Age 8+