Let's see: I can not say entirely for sure what the objects are, but I think they are either rocks or cubes.
As for the void, I am afraid I might not have been clear enough. I had some trouble describing the environment in which the dream takes place, because I do not really pay attention to it in my dream. There seems to be no clear end or beginning to the "chess board" I am on. It would seem my vision is not an active sense in the dream, I would say I am feeling rather than seeing; the only clear details are that the floor is checkered black and white - like a chess board - and shiny, and that there are objects of an unknown nature there. Other than that everything is hazy. I described it as a void, but if you want something more descriptive, I would say it is as if you were to stand on a huge chess board that stretches on into infinity, but there is a fog covering everything, so the chess board carefully fades into grey nothingness a set distance from the viewer.
But this is only if I were to describe it as a picture. I don't really perceive it visually, maybe it will be of more help to describe it in this way: It is as if I am standing on a huge chess board of indefinite size, and staring down into the ground, only noticing my surroundings through my peripheral vision and the general feel of it all.
In any case I am pretty sure that everything, aside from the ground and the objects (the objects I don't know the colour of), is grey.
What colours the objects landed on, I cannot remember. In fact I can not recall dropping them at all, one moment I am carrying one object, and the other I am carrying something else. I am just walking in a dreamy haze carrying objects from one point to another like an automaton (this dream first occured long before Wall-e launched

). It would seem that the entire process of reaching the objects destionation and dropping it is wiped from my memory as soon as I have done it.
All the dream consists of, really, is carrying objects over a checkered floor again and again.
For good measure: It might seem that the weights of the objects are inversely proportional to their sizes.