Visual color timer project: I built this for my son so that he knows how much time he has left for watching shows, until bedtime, etc. It can be set from 1 to 120 minutes, and will fade smoothly through the color spectrum from violet to red. Near the end of the red interval, it begins to pulse. It can also be paused, and it will "breathe" (like a sleeping Apple computer) to let you know it is paused. There is also an LED display on top that will tell you how many minutes remain (or seconds, if less than a minute) if you hold the "set" button while it is counting down.