The Aphex Twin's logo was created, not by Dan Parkes as some sources assert, but by designer Paul 'Terratag' Nicholson in 1992.
Nicholson: "Dan Parkes was the illustrator of the artwork that appeared on the 'Ventolin' release. A s far as I know, that is the only artwork that Dan created for Richard. A little piece of trivia about the logo: at the time I met Richard, I had being doing artwork for a San Francisco-based skatewear label called Anarachic Adjustment. Their 'thing' at the time had been the whole 'alien' vibe (remember, we are talking 1991). So, I had been creating loads of designs based around the letter 'A' which got knocked back. Richard, having seen the work in progress, liked where I was going with the amorphic shape and from these I developed what is now the Aphex 'A.' The logo was finished early 1992, in time to appear on the 'Xylem Tube' sleeve."