Scratchlight ad: A whole city, already printed in gray

Not sure what arrives? Here it is. The city card, already printed in fine gray lines on black. A blank black card. A bamboo stick. You scratch the gray and the color comes up underneath, street by street. Nothing to draw, nothing to set up. At the end there is something to keep, 16 x 11.2 in. Six in ten people buy it as a gift. Order early for Christmas.