Zettel (German: "slip(s) of paper") is a collection of assorted remarks by Ludwig Wittgenstein, first published in 1967. It contains several discussions of philosophical psychology and of the tendency in philosophy to try for a synoptic view of phenomena. Analyzed subjects include sense, meaning, thinking while speaking, behavior, pretense, imagination, infinity, rule following, imagery, memory, negation, contradiction, calculation, mathematical proof, epistemology, doubt, consciousness, mental states, and sensations. 
Editions include a parallel text English/German edition, translated by Elizabeth Anscombe, and edited by Anscombe and Georg Henrik von Wright, first published by Blackwell (UK) and University of California Press (US) in 1967. A 40th anniversary edition was published by the University of California Press in 2007.
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