For me lower doses of mescaline lack visuals other than general shifting/flowing of surfaces, tracers and enhanced pattern recognition. Music enhancement is already present at lower doses. At low doses I close my eyes and see nothing other than an undefined slowly roiling cloud that shifts between red and green. The higher the dose the more the cloud churns and the more intense the red and green shades become.
At mid-level doses objects begin to look vaguely plastic and sharply acute. The MDMA feeling kicks in more and my mood becomes malleable and sensitive to outside input such as music, video and conversation. CEV's start to shift to add more colors to the churning cloud behind my eyelids and begin to morph into liquid surreal objects, faces and scenes. I know I'm at a solid mid-level dose when the churning color cloud is gone, replaced with bizarre liquid neon visions.
At a higher dose everything in the room comes alive and seems to be moving. The stimulation at this level makes it more difficult to shut my eyes but when I do the visuals are filled with intense colors and lots of them. I can judge how high I am at this point by the sheer number of different colors in my CEV's. They look peculiarly liquid, organic and flowing.
The pic accompanying this video is a good representation of a closed-eye mescaline visual for me:
At the highest doses I've done people's faces twist up like taffy and look like faces from a totem pole but in a beautiful serene way as compared to the way human faces appear while on LSD, which is jarring at times for me. The tracers are solid and seem to hang in the air for several seconds. The CEV's are so rich and intense I can only keep my eyes closed for a few seconds before I have to flee from the scene by opening my eyes, being too grotesquely beautiful to bear. At this level I can sometimes see inanimate objects "breathing" and "blocking" and am fascinated by these effects. Psychonautwiki has some very good representations of those effects.
My flesh moves, like liquid. My mind is cut loose.