This is an important description, as when you think of a chemical creating impairment, it is essentially adding noise to signals in your brain, and a lot of the geometric and fractal artifacts we see resemble noise artifacts you would get from interfering with other analogue signals.
Given your brain takes sensory signal input and coheres it, impairing that ability is going to create signals-based feedback that is described in information theory and signal processing, which if there is any periodic sampling going on on the coherance layer, you're going to get shape artifacts that are a function of that period. It's essentially 1/f noise and the experience of "more" information in a hallucinatory state is really just noisy information, like feedback on a TV. (It implies your brain has a clock cycle, and probably something like an NTP service.)
Imagine your TV had worked perfectly for your entire life and the first time you experienced its signal was bad, but you didn't realize there was a world in which that signal could not exist, so it would be totally mind blowing and you might experience it as a rift in reality. It would demand the question, if the people on TV aren't the substrate of our shared reality, and they are only representations transmitted by signals our minds are cohering, what else isn't necessarily real?
You'd tell other people that you had an experience where there is something else, a true substrate of reality where the televisions weren't coherent and real, which seems impossible, but if you've experienced it, you know. Suddenly, the televisions and they things they say are fallible, but there is still a you without them, and one that is not bound to the identity you see reflected in what they broadcast and tell you, because when the TV signal fed back on itself or echoed with delay, now you know there is something behind it all. It seems profound, but it's really just the first time your TV didn't work because something had impaired the signal. This is what I think hallucinogens are: noise on your sensory channels that reminds you the signals you use to cohere your experience exist in a substrate, which is just a mundane fact and necessarily physically true, and "you" are more than what your manage to cohere into a narrative from your sensory input. Some people believe a substrate or perception of something "else" is inconcievable because they have never experienced jitter in their coherence cycles, and once you do it seems like a really big deal, but really, it's not, and most of us just go back to chopping wood and carrying water.