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This was, albeit uncomfortable and painful, an incredibly engaging and fun project.
I started off by mounting a camera to a pole which, with the help of some nifty gadgets and a lot of gaffers tape, I suspended above my bathtub. I mixed non-toxic liquid watercolor paints together with water in a bottle, and, basically, conducted a series of shoots of myself cramming underwater in an undersized bathtub and blowing diluted paint out of my mouth, repeatedly.
I am happy with the results.