I bought this really nice computer desk today on sale at a furniture outlet: a slab of black glass on a black steel rod type tressel. Got it all assembled, in place, loaded up with my nice silver computer ware and wouldn't you know, the f..ing cordless optical mouse doesn't work! I have to use a piece of paper or find an old mouse pad. What a bummer, spoiles the whole effect and I loved having a mouse that worked perfectly everywhere before without any constraint. I just didn't think that an optical mouse needs an opaque surface to work.