..so my friends most prevalent theme is the biomechanic one. He sees living gearwheels crawling through what he calls "Alienflesh", which is a dark organic matter with the consistency of sausage. Mostly dark grey with embossed insignia. It's living, sometimes shaped like a snake, sometimes all around him, flapping it's wings like a bat. It also happened, that he was pressed against it ...or: It pressed him down. He can see it's dark veins, it's big pulsating nerve knots.

Like a gigantic biomechanical beeing of some sort ...muffling him completely. A Membrane of some sort...the outside of the Alien.

Definatly gearwheels! This time my friend tried to look very hard at the patterns...it's a mechanic thing, yet biological. And a funny thing happend:

He always thought that the "carrier wave" tinnutus tone wouldn't exist for him...but he just FORGOT it every time. It's there...

Oh how great it would be if he'd be able to smoke more than 15-20mg in one go....glorious it would be. But it's impossible.

Yes ! SWIM knows exactly what you mean. Creature made of gearwheels is the better description he could do. But theses 'creatures' are fully colored and 3D, not grey. SWIM enjoy a lot when he saw them which seems rather dependant on the dose. Too low and there are not there, too high and other fantastical visions occurs but they are hard to remember.

obliguhl, why is it impossible to smoke more than 15-20 mg?

Finally someone who can relate, garulfo!!
They are mainly grey for Swim, maybe because he sees them at the end of a trip, where things start to fade (after the tone). They use to have tiny colored dots spreckled all over their surface. They're not "beeings" for swim but rather small and interlocking, forming a gigantic biomass of alienflesh. The best thing is, to actually touch this membrane because it's so full of love, my peruvian friend says. They're 3D for him as welll, but really, really tiny and sometimes he has to focus on them to actually see them.

@lonewolf123
Because my friend got a very sensitive throat and he can't take big hits without coughing it out because of the pain. This pain also taints the trip, which is rather sad, he thinks!!
He already uses the best smoking devices.