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Grunewald: The Isenheim Altarpiece (closed) The Holy Trinity by Masaccio was done approximately 1428. It is a superb example of Masaccio's use of space and perspective. It consists of two levels of unequal height. Christ is represented on the top half, in a coffer ....

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.... of the space that the person looking at the work is standing in. The adjustment of the spectator to the pictured space is one of the first steps in the development of illusionistic painting. Illusionistic painting fascinated many artists of the Renaissance and Baroque periods. The proportions in this painting are so numerically exact that one can actually calculate the numerical dimensions of the chapel in the background. The span of the painted vault is seven feet, and the depth is nine feet. "Thus, he achieves not only successful illusion, but a rational, metrical coherence that, by maintaining the mathematical proportions of the surface design, ....