Zawinul used to map his synths so that the scale was reversed (High notes on the left, low at the right). It's a good way to use familiar muscle memory and finger patterns to get wildly different and unusual results, but to my knowledge, no-one ever used it and then learned to play backwards to achieve what they normally could the right way round (not to say that it couldn't be done if sufficiently twisted!).

But I simply feel this is accidentally inverted by shooting into a mirror.