I was in New York City and saw some real interesting lights around 34th and 6th Ave. They look like falling snow flakes. It appeared they were 4-5 ft long and had LEDs on 4 sides. When they were on, the LEDs started at the top and went to the bottom with a fade trail. It looked like falling snow from a distance. Does anyone know who makes these, how to make these, or what they are?