One light-bulb burns, the other light-bulbs function as a lampshade, diffusing and spreading the light. The burning bulb will light up the other bulbs. When the bulb is burned out: simply screw the lamp-holder on to an other bulb. « SPARE » is re-designed for the future: build with 25 classic clear lightbulbs and 1 clear LED-bulb that looks just like a classic bulb. Now you can choose to let a classic bulb or a LED-bulb burn..After +/- 75 years all the bulbs are burned up.
