[Josh Grisdale]

Hi,

Since you mentioned the tenji blocks, you can read about them on Wikipedia: https://en.wikipedia.org/wiki/Tactile_paving. And the guy who invented them: https://en.wikipedia.org/wiki/Seiichi_Miyake

Another great thing here are the toilets: https://www.accessible-japan.com/accessible-toilets-in-japan/

For an example of an accessible bath, check out this one: https://www.accessible-japan.com/hotels/japan/shizuoka/shimoda/mid-range/shimoda-yamatokan/

So, while I don’t know of a specific book, there are lots of unique universal design ideas here in Japan!