The left hand in Chopin's Etude Op. 10 N. 1

All pianists know very well this Etude by Chopin which is one of the most important and most difficult of the author. 

However, there are some aspects that are often neglected because of the technical difficulties of the right hand that has to solve very fast arpeggios, often in very uncomfortable positions, through fluid lateral movements. 

But the left hand is often neglected, where the harmonic sequence is found.>

At the …