Yesterday I tried an underrated drug called trihexyphenidyl. The experience was great and perfect. But I had a strange and funny feeling ( that i enjoyed ) and I am curious about what you call it and if other drugs cause it. So this feeling started at the peak of the effect when I felt a little tired and tried to lie down. Then when I closed my eyes I started seeing imaginary scenarios and events and they were ready and coming on their own( like watching tv ). I am not the one who imagines them. For example, I saw a football match and then after that I saw myself with my friends in a strange place. And many other scenarios. So what is this concept? ( i cant call it tripping bcz i already tripped on psychedelics and this was tottaly different )