I took lsd for the first time two weeks ago and sometimes when I zone out, geometric patterns like carpet appears to morph. I'm not really good at understanding my own thought process, so I can't really tell if it affects me in other areas. From my extremely limited experience however, I would warn against casually taking any psychedelics. For me at least it was a needless experience, with needless aftereffects.
This could be unrelated, this has happened to me plenty of times in the past and I think it could sometimes be related to either lack of sleep, dehydration, or fluctuations in blood pressure.
It's fairly common to see residual effects and trails for weeks afterwards, particularly when tired. I don't know anyone who hasn't had that to some extent after taking LSD.
When my friend was younger and more indulgent with psychedelics, he would sometimes get tracers or flashes of light when tired but they went away eventually. He's open-minded about the human sensory experience so it didn't bother him.
I recommend asking yourself if an idiot would do what you are going to do. Do the opposite. I took lsd by myself, with no one home at 5pm. And only while the effects started to take place did I begin researching the effects. I did not know that you can't sleep when on acid for instance. So maybe don't listen to me. I'm also not so hot mentally, so take what I say with a grain of salt.
Point (3) specifically is easily the worst, because you start researching after you get anxious, and what you find will make you even more anxious, because if you are looking for potential side effects and issues, that's exactly what you are going to find. The positive feedback loop with this one is pretty bad.
I also did point (4). I talked to my grandma on the phone. I called her an hour before I took it, but she called back an hour after I took it. The surprising thing is that I actually didn't have a bad trip. It was just pretty meh after I tried everything in the vicinity.
