From his perch in the East Village, Bobby Williams noticed the revolving spotlight atop One World Trade Center...
I hadn't noticed this lighthouse effect before...? Have you?
A company in Omaha produced the lights. Per this article in the Omaha World-Herald:
The twin beams will revolve horizontally, like a beacon from a lighthouse, 1,776 feet above the city, the company said. They are intended to symbolize resilience, democracy and freedom by illuminating the skies above where the World Trade Center's twin towers were destroyed on Sept. 11, 2001.