Visuals are usually hard to describe, I will take my best shot. The CEV I have gotten in the past were usually on really high doses of hallucinogens and they where vivid images of beautiful landscapes like a lake or a cabin in a forest. Very hobbit-like imaginary. Although I do see stuff I always tend to see the colors with a black background (my eyelids, right?) I have always wondered how CEVs are for other people, but for me they are always vivid colors that seem to blink over a dark background.
Now, the actual experience from that night: I started studying maths this year and for the first time in a really long time I have gotten in touch with geometric figures and their meaning. I hadn't had smoked in at least a couple of weeks and I had a regular sized joint. I layed on my bed with the lights off and I closed my eyes. I started seeing pentagons in a panel-like structure. I saw them with a black background and they were blinking. The colors changed all the time and they were fluor green, red, yellow, like the colors were flowing between the lines of the pentagons. The inside of the pentagons was hollow and I could see the black background through them. I started to think about Pythagoras and the pentagons started to divide into smaller units into which I could "zoom in". The zoom went back and forth, I tried to see smaller units and it seemed to bounce back out.
I hope it wasn't too long, I'm thrilled since it's the first time that I saw actual fractals and they took me by surprise!
