Purely anecdotal, but when I took acid once in college, I became strongly aware of these patterns in the concrete outside my house, kinda of a swirly "leaf like

Purely anecdotal, but when I took acid once in college, I became strongly aware of these patterns in the concrete outside my house, kinda of a swirly "leaf like" structure. Long after the trip had ended, I could still see that pattern, although less pronounced. I had to look a bit harder to notice it. My theory is that the pattern was always there, it just took acid to let me really notice it for the first time. Something about the way that the concrete dries, or maybe an artifact of whatever they do to freshly poured concrete to make it grippy. Could also be pure delusion, so, grain of salt. But I think there is something to the idea that a new / different frame of reference and attention can show you things you may otherwise not have noticed.