Coloring Books for Grown Ups from Origami to Anatomy for Tokyo Thursdays

You can see many adults with crossword puzzles but how many do you catch with a coloring book.
Maybe it is just due to the fact that not many are created and I don't mean the kinky type.

Our friends at PingMag (Tokyo) give us a detailed overview of what Japan offers in Colouring Books with Adults in Mind (by Ryoko).