Set on a deep sill and backlit, translucent collectibles take on an ethereal glow. To up the ante, try modern glass cases—they add levels and have a way of making old-fashioned objects look cool. Scattered groupings of two or three items outside the cases keep the composition from being precious. Don’t feel obligated to use every piece you have. Keep spares safe in a quilted box made for china teacups. For cleaning, use a microfiber cloth made for glass, plus a stiff, angled artist’s paintbrush to get into nooks. Display cabinets by Roost, $70 to $145 each, velocityartanddesign.com. Antique perfume bottles, tudorroseantiques.com for info.