From the perfectly and mathematically rectangular "shelves," that are made out of green lacquer on galvanized iron, to the equally spaced spaces above or beneath the "shelves," Judd was able to give space a powerful meaning in this piece, rather than the actual elements that he made. Space has a meaning, just like in poems. Whether it be to add uncertainty to the poem, a signal to the reader to ponder on a line, or to attract readers who don't want to read a lot, to read that poem. Whatever the reason for space, one can be certain that space is a very powerful. In this piece of work, Judd uses the space to add contrast: from bold colors to flat colors, from a solid to air. The space creates a steady rhythm to the piece.
I don't know if you can see this or not, but in this piece, depth and shades are magnified by the space. The shadows from the shelves onto the empty space give the space a new shape and shade. Justing adding to the powerful quality of the space. Unlike Jackson Pollock, who just copiously dripped and splatted paint on a flat canvas, taking a chance on where the paint fell, Judd takes no chances. He speifically places things a certain way and there is no guessing on what the outcome is going to be. He has a blueprint and follows it. "Actual space is intrinsically more powerful and specific than paint on a flat surface."