OK perhaps I went a little overboard. However I feel very strongly about this particular era of Aphex Twin. I also find it amusing that after years of tracks like 73 yips and Start As You Mean To Go On being favorites of mine, those are the tracks that RDJ himself plays the most in his early sets. I think he even played 73 yips in one of his new sets if I'm not mistaken. Also worth mentioning that there are more versions/pressing etc...of ICBYD than any other Aphex Twin release.
Along with the On ep I put certain other tracks from the period under the umbrella of that sound including the "remix" of Curve's Falling Free, the remix of Meat Beats..Mindstream and a few others that can be found on 26 mixes for cash.
I also put Selected Ambient Works II in this category since it's very much the same sound palette. I see ICBYD basically as SAWII with beats. Perfect mix of organic and synthetic, hard edged and melodic, heavy yet very dreamlike.
This is the period I've always been most obsessed with and the rest of his early material comes in a close second.
For the first 4 years or so of Aphex Twin releases he was almost seen as a messianic figure among many people, something of a prodigy or genius. By the mid 90's he had built an identity of basically there was Aphex Twin and then there was everybody else in the electronic music scene. His style was so distinctive that It was almost unfathomable that he would influenced by anyone else....and that's why I've always found it pretty disappointing that he would be influenced by someone like Squarepusher who I personally never liked and don't put anywhere near the same sphere as RDJ.
I just see a lot of his later period as being more centered around the novelty of "look how complex I can be" but the music doesn't elicit nearly the same vibe or dream like qualities as the earlier stuff because there's never time to really immerse yourself in the sound environment as it's always zipping away in another direction. RDJ was a master of creating simple, minimal yet powerful pieces of music, something that to me is infinitely more challenging and more interesting than creating complexity. But I can see why the younger generations of fans are into that sound, to them music is more like video games and any kind of novelty really impresses them. Each new release has to be "something they've never heard before" rather than just good music that sparks your imagination, takes you on a journey or inspires you in some way. Also people like everything smooth, slick, mellow, soft and cute or silly now. Hence why most contemporary music is the extremely watered down, safe, inoffensive, bland, throw away garbage.
I personally like a bit of intensity in my music. Something with some fire to it.