One of those things you notice while wandering around. It’s not uncommon to find maps for toilets in Japan. Useful in its own way.
Whether this is a one-off, or I had too much time on my hands to notice, this map overlaid a visual and tactile representation. My photo isn’t great, but you can just make out the braille and symbols for different toilet styles, walls etc. They’re the off-yellow marks.
Probably worth reflecting on if you’re creating maps and layouts for your facilities.