Another way to celebrate the Selected Ambient Works anniversary.

Graphic artist Paul Nicholson has shared the illustration details for the iconic logos and typefaces he designed for Aphex Twin.

“The original Aphex Twin logo was drawn by hand using circle templates and rulers in late 1991,” writes on Instagram. “With there being many incorrect versions of this logo floating about, I thought it about time to release the definitive logo construction.”

Check out some of Nicholson’s design details below. He’s also broken down other crucial Aphex iconography, including the Xylem typeface Aphex uses, on his Instagram. [via RA]

Read next: Paul White salutes the world-building genius of Aphex Twin’s Selected Ambient Works 85-92