Musideum, with its careful displays and dramatic lighting, makes it easy to forget that it's a store, and that the exotic instruments - kotos and koras, shenais, santurs, tablas, hurdy-gurdies, zithers and shofars - are for sale. Most people wouldn't know how to pick up many of these instruments, never mind play them, but the mind practically swims with possibilities as you stand amidst all this wood, skin, bone and metal. If you're feeling timid, there's a $35 build-your-own guitar kit.