Chopin’s sonata in b flat minor

Each time I exhume the Chopin’s sonata in B-flat minor, I’m wondering what he had in mind while writing the final movement. Four pages of triplets as fast as possible, pianissimo finishing fortissimo. Strange, but I love it. What I love even more, it’s to take advantage of this final to play an atonal work just after. I don’t know why but moving on to Berio’s Sequenza IV from this nebulous last movement seems to me like the finest delicacy.