Taxi-Top Advertising proves Less is More The familiar plastic, triangular billboards on top of taxi cabs, an icon of the bustling city, are about to disappear into the advertising archives. They are being updated with a sleek, thoughtful, new design by Simon Yan of BlueMap Design, an award-winning design firm in New York City. Working in collaboration with SHOW MEDIA, Inc. and DISTEC GMbH, Germany, BlueMap Design has packed advanced technology into the new billboard design to provide better image quality and at the same time, a more environmentally responsible advertising medium.