The limit switch pairs go in the square loops in the diagram (one shown open circuit = triggered) D1, 2 and 3 are the internal opto-isolator leds, and the opto-isolator output transistors (not shown) ...

and the weight of it activates a hidden switch, which causes the sculpture to display its secret LEDs. [MakeFunStuff] wanted to make something that looked less like a circuit and more like art ...

Controlling this is a single Arduino Nano connected to a pair of A4988 drivers, a MOSFET for driving the magnet, and two limit switches ... matrix of reed switches that close a circuit whenever ...