This massive Google Earth display in Paris includes 48 screens

1) Resolution is much higher this way (11520x8640 instead of 4000x2000) 2) Go for a doctorate in multimedia studies and tell your prof you need 50 screens. Or - try a company that rents multimedia equipment. If you work there, they've always got lots of spare equipment laying around and interested in people that love to find new usages for them. If you're in Switzerland, try http://www.habegger.ch/en/

1) It's cheaper to do 48 screens. You get more pixels to play with, and you can maintain it more easily.

2) This 'sort of thing' is often under the category of high tech 'art'. Folks who have both an artistic and technical eye can, after doing a few pieces, get commissions to do this sort of thing. Of course some Googler probably just told their manager, "Hey how about we create an 8 x 6 display of displays!" The original 'Google Earth Vomit Booth" was in Building 43 which surrounded you with screens so you could zoom around in "3D". Very successful and entertaining to the tourists, and pretty cheap. 8 machines + displays is really only about $8K these days.

One of the things you can do to prototype things is find an inventory liquidation/auction center and check their auctions. Saw one with 150 19" LCD screens that went for $50. You could certainly demo something with that. (same place www.auctionbdi.com sells PC's by the pallet load) you probably need a few pallets to create enough working machines.

Possibly, it's easier to send several 720p (or some lower resolution) signals over multiple cables, than to try to find some interconnect that can handle a 4k signal. Also, if part of the setup is damaged, it's much cheaper to replace a little screen than a 4k projector or a massive projector screen.

Or have a look at this Google project: http://code.google.com/p/liquid-galaxy/