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6 September 2016, 11:56 | Updated: 6 January 2017, 14:45
It's a bit mind-bending to watch, but it's a thing. And it plays Tchaikovsky.
Left-handed pianist Christopher Seed believed that the whole left side of his body is more expressive and agile than the right, and so set about creating an instrument that gives the majority of those melodies to the left.
It's as simple as it sounds - his instrument is a keyboard in reverse - and it was built in the late 1990s by Dutch fortepiano makers Poletti and Tuinman. Christopher sat down to give the instrument its premiere at London's Southbank Centre in 1999.
Here's a look at Christopher's instrument:
And here is, with Tchaikovsky's Autumn from 'The Seasons'