Pilish is a style of constrained writing in which the lengths of consecutive words or sentences match the digits of the number π (pi).
The following sentence is an example which matches the first fifteen digits of π: How I need a drink, alcoholic of course, after the heavy lectures involving quantum mechanics!
[4] In order to deal with occurrences of the digit zero, the following rule set was introduced (referred to as Basic Pilish): Since long runs of small non-zero digits are difficult to deal with naturally (such as 1121 or 1111211), another rule set called Standard Pilish was introduced: Cadae is a poetry form similar to the fib, but based on π.
[7] For his book, "The Burning Door," Tony Leuzzi wrote a series of 33 untitled poems in cadaeic form.
In addition to the main restriction, the author attempts to mimic portions, or entire works, of different types and pieces of literature ("The Raven", "Jabberwocky", the lyrics of Yes, "The Love Song of J. Alfred Prufrock", Rubaiyat, Hamlet, and Carl Sandburg's Grass) in story, structure, and rhyme.