The Swail Dot Inverter is a wonderful tool for introducing braille users to a stylus, as it is a bit like a braille crayon. It is available from APH to construct simple diagrams, graphs, maps, etc. by embossing a series of single dots. Braille paper is placed on top of the 12 x 12 inch rubber pad. The special stylus allows dots to be embossed upwards by puncturing the paper on the down stroke and then pulling the dot upwards on the up stroke.