You go into the toilets.
They are decorated in a way consistent with your expectations. All of the usual facilities are present. They are as dirty as you would expect these facilities to be in a moderately successful art gallery.
You relieve yourself.
There are signs up telling you to wash your hands, however no-one else is present in the vicinity of the sink so you can choose whether or not to do this free of judgement. This truly is an enlightened place.