A great tool for visual sensory input. The slow falling colored oils are mesmerizing and will keep your attention as each drip makes it's way down and joins it's siblings to gather at the bottom for a reverse trip. This is a great calming tool for kids or adults and can be used for timing projects or tasks. These oil timers cannot be left in a sunny location as the colors will fade. They drip for approximately two minutes and are very soothing to watch!