I disgree - a lightbulb what it is it? "An object that instantaneously casts illumination at the flick of a switch" What's in it for me? "Gain the ability to se

I disgree - a lightbulb what it is it? "An object that instantaneously casts illumination at the flick of a switch" What's in it for me? "Gain the ability to see at night. Stop walking into walls, falling down stairs and treading on Lego"