Ryushi Memorial Museum

The Ryushi Memorial Museum (Ryushi Kinenkan, 龍子記念館), located in southern Tokyo, is a small municipal museum dedicated to renowned nihonga painter Kawabata Ryushi (1885-1966).
Nihonga is a kind of traditional painting, and Ryushi, who had a background in Western painting, was a reformer in this field.
This museum was established as a private museum by Ryushi himself in 1963 to house his works. In 1990 it was donated to Ota-ku (Ota City) and has been run by the city since.
The building, which is shaped like a seahorse, was designed by Ryushi.

Ryushi Garden

Ryushi Garden (Ryushi Koen, 龍子公園), located across the street from the Ryushi Memorial Museum, is a house museum which used to be the residence of Kawabata Ryushi.
It's a traditional-style house with a traditional-style garden designed by Ryushi himself, and he lived here from 1920 to 1966.
The main building was burnt down in WWII and present one was reconstucted around 1948-54, but the studio building, which was built in 1938, survived the war.
Though it's free of charge, you cannot walk around Ryushi Garden freely - the staffers of the Ryushi Memorial Museum guide the visitors three times a day.
Note: there's a day in spring when you can walk around Ryushi Garden freely. On that day, the Ryushi Memorial Museum will also be admission free.