Forget Ferris wheels, fun houses, funnel cakes, corndogs or whatever else you associate with fairs. That is not what this new Mint Museum exhibit is about. Instead, Inventing the Modern World: Decorative Arts at the World’s Fairs, 1851-1939 showcases extravagant glass, furniture, jewelry, ceramics, metalwork and textiles. If you’re like me and decorative art at a fair seems foreign to you, that’s because in those days (remember, we’re talking 1851-1939, when technology was limited) it was a way for folks with money to make a big purchase and see new designs from around the world. Exhibition highlights include an extraordinary Fabergé tiara fashioned from hundreds of tiny rose-cut diamonds set on knife-edge mounts, which gives the tiara the appearance of woven lace. Items from Tiffany & Co., Lalique, Cartier, and Boucheron will be represented. And you thought a fair couldn’t be classy?