Viewer discretion advised: contains gore (not really).
Boulez's second notation fits snuggly in 20 seconds. But within this 20 seconds are 4 glissandi and a hand crossing dance of rhythms. Can you tell if all the glissandi went in the same direction or in different directions?
To any pianist attempting this any time soon, keep your skin moisturized and lubricate them for the slides, lest the ivory keys draw blood.
In the last video, I played Notation 1. Check it out if you missed the inaugural video! Notation 3 is coming as the next video. In comparison with the Notations 1 and 2, it's slow and disorienting.