Thanks Paul

it means a lot.
I didn't actually think of that light dark thing. I might make the dark bits to be the same colour as the brown unportalable walls if it looks good.
There's one other question I forgot to ask last night:
||What's his name? I want it to sound like a bad guy title, but not come all out and say "Bad guy cube" or "enemy cube". So far I've got:
"Weighted Nemesis Cube
Weighted Rival Cube
Weighted Scoundrel Cube
Weighted Adversary Cube - my favourite so far, don't know why. It just sounds to me like something GLaDOS would say.
Weighted Champion Cube - this one requires a bit of explanation:
This came from the idea that GLaDOS really likes the bad cube. She's proud of it. He's like the favourite child of the cubes in GLaDOS' eyes and she urges you to bond with it. Also champion sounds a bit like companion.
This may change however, I may make it so that GLaDOS sees the cube as the 'black sheep' of the cube family essentially. I've not quite thought GLaDOS' role through properly yet.
Actually, just thinking about it. I think a "bad guy" name is a bad idea, since the player will work that out on their own that he's bad, if I've done this right. So maybe it should be just as friendly a name as "companion", as a dark contrast to his adversarial role in the game. This will also compliment GLaDOS' favourable treatment of him, because she wouldn't really give something she liked, a name like "Adversary".
Weighted Comrade Cube?
Weighted Complement Cube?||