i have always loved iron man and when the first film came out i saw some "collectible props of the arc reactor" floating around on the web. they were great and i wanted to see if i could make one.
i had access to a laser cutter so i gave it a try.
this is how i made mine. its maybe not screen perfect or cannon but i like it and it was fun to make.
the second image is the main one i used to make my prop. its from http://marvel-movies.wikia.com/wiki/File:Mk_1_Arc_Reactor.jpg