Night writing visited the National Institute for the Blind in Paris, France, where he met Louis Braille. Braille identified the major failing of the code, which was that the human finger could not encompass the whole symbol without moving and so could not move rapidly from one symbol to another. His modification was to use a six-dot cell, the Braille system that revolutionized written communication for the visually impaired. Night writing Night writing, a.k.a. sonography, was a system of code that used symbols of twelve dots arranged as two columns of six dots embossed on a square of paperboard, and is now
Polka-dot paint Polka-dot paint Polka dot paint is a paint which produces a polka dot pattern. The paint is traditionally an impossible object, and the subject of a fool's errand prank played upon apprentices in the decoration or construction trade, who are sent to obtain a bucket of polka-dot paint. A polka-dot paint effect has been produced in stage magic, and in the 1950s a polychromatic paint was invented which produced a dotted effect when dry. In the United States several magicians invented a trick in which they demonstrating painting with polka-dot paint. Prior to the performance, an object is pre-painted in