Sengai
Though the Rinzai sect is particularly known for its hard-to-understand teachings, Sengai tried to make them accessible to the public. Works. One of his most notable paintings depicts a circle, a square and a triangle. 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.