Fuck literal arguments, just realize if someone says "hydroponic" in the context of mushrooms they probably just mean indoors.
Visuals depend on dosage and individual reaction. I usually see faces even in the otherwise most unremarkable of textures. Patterns flow, the floor warps...depends on what you're looking at really. Video games can be a challange, the most fucked up I've ever been on mushrooms me and some friends were playing Goldeneye 007 but things were so much different to me than they 'really' were.
Looking at computer screens I have noticed faint traces of text, words bouncing and moving.
Don't forget to look in the mirror either.