Though seemingly disparate forms of literature, print poems and ergodic poems share common central elements. Both forms of literature ask the reader to construct meaning from words, interpreting the author’s message or crafting a message of his or her own. Though print text is static, its meaning can change over time for a reader. Just like how a text’s meaning can change for a reader over the course of his or her life, ergodic literature’s meaning can change at a much faster rate, thanks to text generation programs. Both can also place restrictions on the author in terms of form. For example, sonnet writers must work within the space of 14 lines allotted to them, and haiku writers must meet a strict syllable length. Ergodic poetry, too, can demand the writer frame his or her work inside a set of rules. The defining difference between traditional and ergodic literature, according to Espen J. Aarseth, is that ergodic literature requires a higher degree of participation from the reader than traditional text does.