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on the one hand, you have lot of sinking islands
on the other, you have the italian concrete producers and the murano glass makers
my solution is to concrete in the lagoon and the waterways,
and then cover it all in beautiful glass from murano to imitate the water
this should keep everyone busy for the next fifty years
no doubt they're designing a stained glass window glorifying my image at this very moment
q.e.d.