The visible spectrum column is composed of a stack of prime number sided prisms (3, 5, 7 , 11, 13…43). Each face is colored with a corresponding solid color from the spectrum of visible light.  Due to the nature of the dispersion in the spectrum with darker colors at the shorter and longer wavelengths of dark violet and dark red respectively and brighter colors of cyan, green and yellow in the middle of the spectrum, this column has a light side and a dark side.  The fact that each level has a prime number of sides has the result that every color on the total 8 foot height of the column is unique with the exception of the green stripe that runs down the reverse side of the sculpture.