Binary code practical applications such as computers, electric circuits, and more. The bit string is not the only type of binary code. A binary system, in general, is any system that allows only two choices such as a switch in an electronic system or a simple true or false test. Braille is a type of binary code that is widely used by the blind to read and write by touch, named for its creator, Louis Braille. This system consists of grids of six dots each, three per column, in which each dot has two states: raised or not raised. The different combinations
How to Read a Book makes a brief argument favoring the Great Books, and explains his reasons for writing "How to Read a Book". There are three types of knowledge: practical, informational, and comprehensive. He discusses the methods of acquiring knowledge, concluding that practical knowledge, though teachable, cannot be truly mastered without experience; that only informational knowledge can be gained by one whose understanding equals the author's; that comprehension (insight) is best learned from who first achieved said understanding — an "original communication". The idea that communication directly from those who first discovered an idea is the best way of gaining understanding is Adler's argument