Baconian Ciphers (named after Sir Francis Bacon)

A graphic similar to this one appears as the masthead of each issue of Cryptosystems Journal.

Baconian ciphers can be considered to be partially cryptographic, but mostly steganographic.

Cryptography's primary goal is to keep the contents of a message secret even though someone may happen to obtain its transmission (e.g. through a wiretap).

Steganography's primary goal is to hide the very existence of a message.

The Baconian cipher was invented by Sir Francis Bacon in the 16th Century.
It is an ingenious way of hiding a secret message in what appears to be something perfectly normal.
The cipher is comprised of two sympols AND IS THEREFORE A BINARY SYSTEM.
The two symbols are usually called "a" and "b" which are combined in groups of (historically) five to represent
any letter of the alphabet. Hint: The baconian graphic on the home page uses 8-bit ASCII as its character set.