The following is repeated from this April 2011 post.
Christ of St. John of the Cross, painted by Salvador Dali in 1951.
The painting is known as the "Christ of Saint John of the Cross," because its design is based on a drawing by the 16th century Spanish friar Saint John of the Cross. The composition of Christ is also based on a triangle and circle (the triangle is formed by Christ's arms; the circle is formed by Christ's head). The triangle, since it has three sides, can be seen as a reference to the Trinity, and the circle may be an allusion to Platonic thought. On the bottom of his studies for the painting, Dalí explained its inspiration: "In the first place, in 1950, I had a 'cosmic dream' in which I saw this image in colour and which in my dream represented the 'nucleus of the atom.' This nucleus later took on a metaphysical sense; I considered it 'the very unity of the universe,' the Christ!"