Arranging and conducting auctions in the field of art and collectibles; Arranging and conducting special events for commercial, promotional or advertising purposes; Auction management services provided to others over an on-line web site accessed through a global computer network; Auction services; Conducting trade shows in the field of art and collectibles; On-line auctioneering; On-line retail store services featuring art and collectibles; On-line trading services in which seller posts products to be auctioned and bidding is done via the Internet; Operating an on-line shopping site in the field of art and collectibles ; Retail store services for works of art provided by art galleries