Thanks, brother, it's starting to take shape now I've got the cowl fitted in the middle, now it's a case of taking sandpaper to the inside to make it opaque enough to conceal the actual light
The answer to the world's energy problems
Nah, just kidding It's a prop replica I'm building of this:
In the movie, it's referred to as an arc reactor, a (what is most likely) cold fusion reactor which powers an electromagnet keeping shrapnel out of Tony Stark's heart, and his Iron Man armor.
I'm building a replica which I'm going to mount in a mannequin, which I'm going to paint up to look like marble