Sengai

Though the Rinzai sect is particularly known for its hard-to-understand teachings, Sengai tried to make them accessible to the public.

Sengai left the painting without a title or inscription, save for his signature.

The painting is often called "Maru-Sankaku-Shikaku", written as "〇△□", or "The Universe" when referred to in English.

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"〇△□" or The Universe (Edo period)