MILAN — A secret in plain sight. The Tivioli store in Milan couldn’t be more central, with its premium location in Via Santo Spirito — in the city’s Golden Triangle — and yet it is immune to the tony shopping district’s fanfare and congestion of high spenders and passersby peeking in through the windows.
Only a few people suspect the store has quietly stood there since the ‘90s, it boasts interiors designed by the late…