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This article investigates the notebook kept by Lev Vygotsky during the first half of 1926. In addition to discussing the notebook's structure, content, and time frame, the article analyzes its significance within the context of the development of Vygotsky's ideas. Among the notebook's content discussed here are: supplementary material to The Psychology of Art; a preliminary outline for "The Historical Meaning of the Crisis in Psychology"; the first propositions of cultural-historical theory associated with the idea of sign mediation; an outline for the unwritten monograph "Zoon politikon"; as well as thoughts on a general psychological theory of consciousness that assigns a key role to speech and communication in the genesis of consciousness. Particular attention is paid to Vygotsky's remarks on the ontological status of mental reality and the problem of the psychophysical.