Fire jets!

Emmett has been pretending that there are "fire jets" all over the house. Some of them have very complicated (imaginary) contraptions that set them off, others he seems to be able to set of at will. He talks about them often with Luke, who has joined in the game and tells me where the fire jets are, too. I've seen the two of them sitting in the dark in Emmett's room, waiting for the "fire jets" to light things up.