The massive images of snowflakes on the sky scraper moved slowly over the entire building and would stop and fade near the top of the (probably 12+ story) tall tree.
'06 Xmas tree in Rockefeller Center, NYC
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A shot I took of last year's tree (also about to be used in a turkish publication :) : flickr.com/photos/badison/78098043/
More info: www.wnbc.com/christmastree/index.html