whats the blue thing in sunshine

when i play sunshine this appears on my scren sometimes what is it?

EDIT: Looked it up. The only answer I can find states that it's there to prevent you from seeing the void below the map with the camera(like how you might see through a wall if you're to close to it). It just blues out your screen so you can't see the camera clipping, I guess. I can't tell what would be causing it right here tho... The buildings on the right, maybe? I haven't played in ages.

EDIT 2: Yeah, reading is hard for me apparently. It happens when a building gets in the way of the camera. It's in the game manual. Obviously you're on Dolphin(I assume since you said so for Wii) so you wouldn't have that, but it's interesting. So, yes, it's to stop you from seeing straight through a wall(not sure if it's a wall behind you or what), but the camera is simply not having that.