This is meant to be an in-universe portrait of the creation myth in my homebrew fantasy world. Basically, the spheres are primordial elemental energies - fire, water, earth, wind, ice, and lightning - condensed into a physical form. The big beam in the middle is the Light element that's sort of "visiting" the others, and the featureless white pillar is a sort of canvas they conjured up together so they could start building the world, as a way of impressing their visitor.