Tribute In Light Returns For 16th Anniversary Of September 11 Attacks

The lights were tested in 2015 (Getty Images)

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The lights were tested in 2015 (Getty Images)

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The test, from Brooklyn, in 2015 (Getty Images)

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The test, from Brooklyn, in 2015 (Getty Images)

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A 2013 photograph of one of the lights (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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A 2013 photograph of one of the lights (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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A 2013 photograph of setting up the lights (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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A 2013 photograph of setting up the lights (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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The lights in 2013 (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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The lights in 2013 (<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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(<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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(<a href="https://www.flickr.com/photos/lumn8tion/albums/72157647406165916">Paul Ker / Flickr</a>)

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During the 2015 test (Getty Images)

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During the 2015 test (Getty Images)

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During the 2015 test (Getty Images)

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During the 2015 test (Getty Images)

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