https://link.springer.com/article/10.1007/BF01965761 https://link.springer.com/article/10.1007/BF01965761 Roland Fischer did an experiment in the 70s and found

https://link.springer.com/article/10.1007/BF01965761 https://link.springer.com/article/10.1007/BF01965761 Roland Fischer did an experiment in the 70s and found that students on lsd were able to identify parallel lines more accurately. Iirc in gwerns experiment he dosed every day, and lsd tolerance builds pretty fast.