The toaster is dumped unceremoniously onto the floor, and a roll of paper spread. "Grab a stool. We're schematicing." Already drawing with a mixture of broad strokes for outline, then delicate text for details. "See, you can have vials here, and trigger them each to a different finger. Pull the right ring, and you get the color you want. Or chemical. Or both. Some fire burns hotter, y'see..."