Here's an animation of the two memorial fountains at the World Trade Centre site in New York, which are due to open in three weeks time on the tenth anniversary of the 9/11 terrorist attacks.
The two sunken fountains designed by architect Michael Arad and landscape architect Peter Walker occupy the exact footprints of the twin towers, which were destroyed in 2001.
Each waterfall will plunge 30 feet into a square basin then another 30 feet through a smaller hole in the middle, with the names of victims inscribed onto bronze plaques around the perimeter. The fountains are set in a paved plaza that's planted with 415 trees, all identical in size, beneath which a memorial museum is under construction.
See Dezeen Wire for a review of the memorial by architecture critic Rowan Moore and his take on the political and professional infighting that continues to surround the project.
The animation is by Los Angeles digital designers Squared Design Lab.