When you twist a knob or flick a switch to turn a lamp on, it trips a mechanism within the light to connect the light bulb to an electric current. A lamp series called Node perfectly illustrates this simple science lesson. 

Designed by Dutch design studio Odd Matter, Node copper lamps take their inspiration from simple electrical drawings. The wall-mounted lights consist of metal rods that can be adjusted to connect or disconnect the circuit, switching the LED bulbs on and off. They look a little like giant paper clips being folded and unfolded.

Living with them might be tough, though. I'd happily spend hours fiddling with these things. 

[h/t: Co.Design]