Two day flowering

from w
We have a dozen or more very unattractive succulants in pots, very shabby, full of holes or broken, really grouse, but.... every now and then they flower with red and pink blossoms which last about two days. I can't recall what the plant is called. Anyway before another one bites the dust, here's an oil pastel I did this afternoon. I think it's rather symbolic - don't judge a book by its cover, don't jump to conclusions about people. They may have their day in the sun. They may find grace in their life, even if only for a moment. Oh, too many cliches there!
(later: Is it called a cereus?)