I am a bit embarrassed to say that there could have been two cactii in this drawing. The other one lasted for a few months and got ‘thinner and thinner’ until it reduced to a piece of tiny prickly rubble. Methinks over watering was what ‘done it in’. Plants do it tough on my balcony.
The surviving cactus, as you can see, is flowering. Well, one flower. I find it amazing that a prickly round thing like this cactus can produce such a delicate, paper-thin looking flower. Just lovely.