Artist Aakash Nihalani uses brightly colored tape to create isometric rectangles and squares in locations around New York, and has recently started a series where he interacts with these geometric shapes to great effect. Via his web site:
For however briefly, I am trying to offer people a chance to step into a different New York than they are used to seeing, and in turn, momentarily escape from routine schedules and lives. We all need the opportunity to see the city more playfully, as a world dominated by the interplay of very basic color and shape. I try to create a new space within the existing space of our everyday world for people to enter freely, and unexpectedly ‘disconnect’ from their reality.