Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
The Blind Leading the Blind their staffs, seems about to drag his companions down with him. A cowherd stands in the background. Bruegel based the work on the Biblical parable of the blind leading the blind from Matthew 15:14, in which Christ refers to the Pharisees. According to art critic Margaret Sullivan, Bruegel's audience was likely as familiar with classical literature as with the Bible. Erasmus had published his "Adagia" two years before Bruegel's painting, and it contained the quotation """" ("the blind leader of the blind") by Roman poet Horace. Bruegel expands the two blind men in the parable to six; they are well