Do you have a things-to-do list which somehow doesn’t end just because you forget or do not complete the tasks on time. Here is something which could be of help. Take a look at this Shoulda Woulda Coulda clock by Maria Bergstrom which necessarily reminds you of the undone tasks as time ticks on.
The arrangement consists of a clock face with a hand and a collection of round colorful magnetic discs. In this case each disc represents a single task so the user can stick them on the clock face. As the hand moves on with time, the discs would start accumulating if each of the task is left as it is; thus providing a reminder which cannot be easily missed.