Special glass and films only work when the visible light is at a seven-to-one ratio , '' said Steve Pesce , the owner of New York Window Film in Farmingdale , N.Y. , which has installed window films at the International Center of Photography in Manhattan and at Sagamore Hill , Theodore Roosevelt 's home in Oyster Bay , N.Y . In other words , if the sun is bright , people looking in will see a reflection of themselves .