Explain the Light Bulb to Cavewomen and Cavemen

A light bulb is an object humans created to have constant sun. Even when it's dark, we can have light. Humans have created different words for these objects, but I will try to explain it to you in the easiest way. We have invented something that is like a shell, those ones that you can look through but it's closed, like a hollow shell. Then we have invented something which we call wires. Through these wires, electricity flows. Electricity is like sunday, but it's not hot. It works just like when you would burn a piece of grass, the fire goes from one end to the other, and then when it reaches the inside of the shell it is trapped inside and keeps burning. Electricity works like this, except it's not as hot, so it doesn't burn/melt the shell. We can even control when to turn it on and off, and it always works. There is a switch on the wall, a small button, like a lever and when you push it it goes on and when you push it again it goes off. It's as if you're lighting a match to start the fire that goes to the shell. And this electricity never goes out unless you push the button.