I hope I’m not too late to join this particular party, but the latest theme for Monochrome Madness is/was ‘chair’ or ‘chairs’.
These particular examples of functional utilitarianism can be found in the waiting room of the main hospital in the town of St-Junien.
(Well, I say waiting room, but in reality it’s just a corridor with groups of colour-coded seats outside a long line of consulting rooms). In colour, these are actually a lurid, determinedly institutional green plastic, but the monochrome conversion does bring out some interesting textures, notably on the backs, that are quite invisible in their ‘natural’ state.

It is never too late for a photo challenge I reckon, well maybe a month later 😂
Basic functional chair can take on a different look in monochrome. I like the one on the right. It looks like the lower part of a face with a nose and mouth.
Thanks for joining in my MM#29 prompt 😀
Waiting room chairs are often very uncomfortable. lol. Great image.