This is a peculiar requirement, and it’s highly doubtful a product or even a circuit exists for such a function. This meant [Joel] would need to roll his own board to accomplish the task.
Electricity will only travel around a circuit that is complete. That means it has no gaps. You can use a switch in a circuit to create a gap in a circuit. This can be used to switch it on and off.
There is no more electrical energy to power the lamp. Let’s change the circuit again and add a switch. A switch turns the circuit on or off by completing or breaking the circuit loop.
Circuit does have 24 placements (a series first) and the final shot appears to show more than 12 characters. No title or release date has been given, but its inclusion in the Switch 2 announcement ...