in my experience (which is somewhat limited) I've gotten my most intense visuals on higher dose mushroom trips. i know pretty much every psychonaut out there has an opinion on the subject, so lets hear 'em

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kill the white devil.

visually, dmt or dpt are the strongest. pretty sure you won't find anything stronger

Mescline and cola

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pancakes

I was going to say DPT.. everyone was saying "it's a really mild psychedelic", my asshole. The visuals are mad sick and I found it to be just slightly introspective enough to make it interesting, the nausea wasn't too fun though.. nothing heddies couldn't fix

DON was another pretty neat one, I was looking at one of those cheap blue painted "party lightbulbs" and it appeared to be strobing, ceiling fan was spinning 1,000,000 miles per hour (granted it was turned off)... pretty neat shit, the nausea was goddamned near unbareable and required a hellacious amount of mj to calm the stomach.

From what i have tried i wud have to say PCP or high dosage(quarter oz) of blue tipped mushrooms. they got me sittin on the moon for hourrrs!

I have never had anything stronger or more visual than a breakthrough dose of DMT. (100mg+)

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what about lsd.i just love shrooms-really great tripps i have had

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The visuals I have gotten with LSD have been less than impressive, but that's just me.

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my vote goes to LSD due to the in depth, beauty, and meaningfulness images printed on my eyelids.

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I'm not trying to talk bad in any way about other people, but why do most people throw in the most common of stuff like LSD and shrooms for a question like this? Those things are fun yes, but the question was about visuals. those aren't going to send you to another planet. I've had good visuals off both, but for the most part i just get goofy for a little while. If you smoke a good amount of dmt, you will not be in the same room you were when you smoked it after a few seconds...and thats with eyes open. if you snort 100+ mgs of dpt...pretty much same thing. i would probably say most people couldn't handle it.
If you're looking for most fun with strong visuals, theres so many different chems out there to choose from. I've had good experiences with DOB or any other DOx for that matter, but all those last 15+ hours. 2c-e was also fun, but its a huge body load if you take a lot.
My suggestion to the LSD people....try other stuff as well.