Good Morning, Afternoon, Evening, Night!

Hello Proserpina, Orchids can thrive in very small pots as can some succulents. We had an orchid in a pot that was 3" at top and 2.25" base for a couple of years when I potted it on because the compost needed changing. I could have trimmed the roots a bit and put it back in the same pot though. Some bonsai trees can be in very small containers and can be fascinating to grow.

Sounds like flip flops would be a good idea in the shower.