Buzz Wire
get the loop to the bell without touching the wire.
the fete buzz wire: drag the loop along five bent copper wires to the bell, and a touch buzzes you back
The wire runs through the loop. Drag anywhere and the loop moves with your finger, on a wand, so your thumb never covers it. Touch the wire and it buzzes, and the loop goes back to the last red post. Red tape is insulated: rest there. Five wires, a smaller loop each time, against the clock.
Concepts: attention, feedback-loops, precision.
An interactive you play with one thumb, on Wundr.