Super snapshot of a speedy dice

Thought you might like a little relief after discussing all the really complicated problems on this topic!

If you looked at a realitivistic dice travelling really fast in some frame with it's '3 face' facing in the direction of motion (along the x axis say), what would it look like to a (distant) observer in the same frame who's looking up at the dice ( so looking at the underside or '6 face' ) as it shoots past (at right angles to) them.

By 'see' I mean you take a photograph of the dice by having a photographic plate along the x axis that receives parallel light from the dice - this way you don't have to worry about a lens or crap like that. Think about the effect of light travel time and what rays arrive when.

And remember that opposite sides on a dice add up to 7...