(really) nice site + curation, but what's the target audience? it seems like it's going to be too high priced / limited numbers for mass market sales? do you display prices to registered users? if not, how do you expect to filter large amounts of queries (i'm confused about the balance between wide audience and price / quality)? is the best way to see this as a portal to established (commercial) galleries (with a few "big" exhibits thrown in to keep it looking good)? if so, how do you plan to attract return visitors?

i know i asked similar questions here before, so apologies if this is to the same team. also, from that discussion, are you worried about people's reluctance to buy before seeing "for real"? maybe location filtering would be useful?

(finally, maybe just me, but i was (am?) confused by your use of "collection" and whether that meant creating on-line "favourites" or actually owning a piece of art).

oh, and this seems to be aimed at the us market, but op is italian

EDIT - the nyt link from cvursache answers much of this (i hadn't realise this was related to the art genome project)