... Glossary of the laboratory-chair . ... Laboratory-chair of modelling the natural references of time . ... Substitutional motion . ... Extremal principle of substitutional motion . ... Systems' entropy time . ... Generating flows as the World objects' variability sources. Natural references of the "course" of time, or formation. ... Proof of an analogue of Gibbs' theorem (on the equivalence between the entropy extremal principle and the minimal substitutional time principle) for multilevel systems. ...