Negative harmony
Flip any chord through the mirror.
Progression · key of C
Tap notes on the wheel to build your own chord (up to 6 notes). Play, then flip it.
Original
Mirror
About this toy
In a 2017 interview Jacob explained negative harmony, and a lot of people went back to their theory books. The idea comes from Ernst Levy: draw an axis through the circle of fifths, between the tonic and the dominant, then reflect every note across it.
Major turns minor. G7 turns into Fm6. The cadence still lands, but it feels like it happened underwater.