From the instructions:

“Play through the piece as written, observing all note durations in relation to one another. Roughly speaking, one inch of space is equal to 3 seconds.

Groups of notes that are surrounded by a box are played simultaneously.

Events that are connected by lines should be played as close together as possible without having the events sound simultaneously.

All note lengths should be as short as possible, without pedal, and with an aggressive percussive attack.

The dynamic for the entire piece is Forte.”