This contemporary composition explores modern harmonic structures and mathematical motifs. Its distinctive quality lies in the stark shifts in texture and atmospheric dissonance.
Managing the large spans and pedaling requirements for sonority is the primary challenge.
Comparable difficulty and character — good candidates for what to learn next.
108 (4+8+15+16+23+42) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 108 (4+8+15+16+23+42) lasts about 4 minutes.
108 (4+8+15+16+23+42) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include 108 by Christopher Andrew Walker, ((≠)) by Christopher Andrew Walker, 'The King of the Jews' - Incidental Music by Alexander Glazunov — see the full similar-pieces list on this page.