I think there is something in it. Regardless of the overall effect there is usually reference to zigzags, metallic or silvery surroundings, swirls and spirals. I will say that my own experiences with hallucinogens made colours and sounds uncomfortable, which would explain ancient mans use of caves. Everyone I know who has experienced hallucinogens say that straight lines "dance" and zigzag back and forth and I know of 2 people who have experienced the feeling of falling through a swirling vortex (sadly not myself). This seems to be regardless of the hallucinogen and these are generally just mild substances when compared to Ibogaine or Ayahuasca.


Just a few mushroom images, usually seen alongside bird imagery, swirls, zigzags etc

http://dreamstudies.org/2008/1[...]allucinogens-in-the-stone-age/

Tanzanian mushroom headed people- http://www.racctz.org/FoodofheGods_files/blocks_image_2_1.png

Saharan ancient art of mushrooms- www.saharajournal.com/13/graphics/b-Dupuy3-175.gif

I really like this guy holing a mushroom in one hand and a big swirl in the other- http://travel.sulekha.com/unit[...]f-the-cedars-blanding-utah.jpg

Texan rock art with concentric circles and a mushroom- http://www.dirtbrothers.org/pbone/SweatLodgel.jpg

** I was trying to find a picture I have seen in a book (cant even remember which bloody book now! Possibly "The Spirit Molecule" Or maybe "The Cosmic Serpent" ) of a cave drawing of a man standing in a spiral and he has mushroom sfor fingers. Cant find it though!**

Im not saying that it is ALL the case of being on a trip and drawing what you see, but there is a huge amount of imagery across the globe of swirls, zigzags etc, AND a huge use of hallucinogens by these same people. Once something is used a few times and others see the symbol, it can simply become a symbol that people use, whether they understand why they use it (or even why they make the stone circles) is debatable.