In 1291 the Venetian Republic ordered every glass furnace in the city moved to Murano, ostensibly to protect a timber-built capital from fire, in practice to fence in a trade secret. Glassmakers gained privileges and lost the right to leave. The island became a monopoly with a moat. Burano, three kilometres further into the northern lagoon, developed along a different line. Its economy ran on fishing and, from the sixteenth century, on punto in aria needle lace — worked without a backing fabric, stitch suspended on stitch. The painted houses that now define the island were reportedly a navigational convenience, colour blocks legible through lagoon fog, later codified into a permit system still administered by the comune. Torcello, the third island on most itineraries, was the earliest settled of the three and is now the emptiest: a population once counted in the thousands has fallen to a few dozen residents around the cathedral of Santa Maria Assunta, consecrated in 639 and holding a Last Judgement mosaic in Byzantine gold. A murano and burano tour from venice usually threads all three by water, since no bridge connects them. What survives is craft under pressure. Fewer than twenty furnaces still operate on Murano, down from hundreds at the height of the trade, and the Vetro Artistico Murano trademark exists precisely because imported imitations undercut the originals. On Burano, the Museo del Merletto records a lace tradition now sustained by a handful of practitioners, most past retirement age. Venice lagoon boat tours have become part of that economy rather than an observer of it, and the better murano and burano tour from venice tickets fund workshops directly. Architecturally the islands reward slow looking. Murano's Basilica dei Santi Maria e Donato carries a twelfth-century mosaic pavement of opus sectile marble and a Byzantine apse of stacked arcades. Burano's campanile at San Martino leans visibly, arrested but uncorrected. Torcello's cathedral retains its original marble iconostasis and shuttered stone windows, hinged slabs rather than glass. Entry to Burano itself costs 0 EUR, with free entry to the island; museums on the island may charge separate fees. The address is simply Burano, 30142 Venice, Metropolitan City of Venice, Italy — a set of quays and canals rather than a gated site. Guided Venetian island excursions and glass factory tours are what convert that openness into something legible: an hour in a furnace, an hour among the coloured facades, and a clearer sense of why a republic once imprisoned its artisans on an island to keep them.