> What's interesting is that they have this in some soccer stadiums.

They have it in all soccer stadiums I've seen on TV :-)  Usually ones on the 
floor either side of the goal.  Also at some stadiums they have two "tiers" 
of advert banners around the stadium, but they display the correct images to 
make it look like one continuous layer of adverts even though one is about 5 
metres behind and 2 metres higher than the other.

> Apparently not that sensitive to camera motion. My brain is fooled every 
> time - even though I know it's 2-D and not a 3-D billboard.

At soccer matches the main camera doesn't move, it just rotates, so the 
illusion should be kept all the time.  Obviously when the director switches 
to a different camera the effect is ruined.

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