It is possible to build electronics into the most basic and fundamental systems. Here we have an example of a childs shape sorter game in which the student has added a simple Astable circuit (https://sites.google.com/sheffield.ac.uk/diamond-electronics/3-building-and-testing-circuits/astable) connected to a series of push switches. When the child puts the correct shape into the correct slot, the buzzer sounds. Could you use an Arduino to do this? What other inputs and outputs could you use?