A train ride out to Ochanomizu and a short walk leads to Ochanomizu Origami Kaikan, a 6 story centre specialising in high quality traditional Japanese paper. The current gallery exhibition features samurai hats. There are classes in paper craft going on all the time. The staff are happy for visitors to wander around, including into the paper making workshop where we watched paper being painted and hung.
All things origami and washi paper are available in the shop which we will visit again at the end of this trip. I was in heaven.