PIER54_190601_04
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The construction in the background is for Pier 55 park, originally referred to as "Diller Island". It's a $250 million floating park originally to be paid for by media mogul Barry Diller and his wife, the fashion designer Diane von Furstenberg.

As reported on https://gothamist.com/news/pier-55-floating-park-hudson-finally-taking-shape
The 2.4-acre park designed by Hudson Yards' Vessel designer Thomas Heatherwick is meant to resemble a leaf floating on water. To achieve that delicate effect, workers have been installing 132 tulip-shaped concrete pots which rest on pilings in the river. According to a NY Times story, each pot weighs more than 90 tons.
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