A painter might use their recall of that thing that was - visual, tactile, aural: A particular interval of pain somewhere between that "real" world and what might be at this moment. Memory provision of those particulars, with temporary retention of a blur image: Primal, instinctual, destruction, apocryphal and serendipity.
All to create a painting. Then bliss. Then the hangover.
Next day, do it all over again.