space that inverts out of the frame creates a dimensional d, an i can be formed by the shape as a whole or the space that's inverted out of the d. in the iteration that follows, the square that's added to the top can add to that perception of the i. The center of the d also leads the viewer inside and through to another "dimension". Also, the coloring--blue and orange are complementary (or in other words, inverse sides of the color wheel.
(This comment references Entry #51)