I have been making these for a couple of years now. I consider it an alchemy of sorts- don't ask me to explain the science behind it, but I add various mixtures of pigments, solvents, inks, spray paints, adhesives and air- and swirl it around in a toxic mixture until the precise moment when its done- then empty out the remains. Too much fun!! I love the fluid mixing. The first few are always "klunkers" until I get the hang of it again (not having done it in a year), but once it comes back to me, its an annual process I look forward to..