The book explains why and how Wittgenstein adapted the Tractatus in phenomenological and grammatical terms to meet challenges of his 'middle period.' It also shows why and how he invents a new method and develops an anthropological perspective, which gradually frame his philosophy and give birth to the Philosophical Investigations .
"Mauro Engelmann's book is a contribution to middle Wittgenstein studies that we can be most grateful for. ... Engelmann's book should be among the first to be linked directly from Wittgenstein Source, helping to make the Wittgenstein Nachlass more widely used and useable ... . it is Engelmann's achievement to have given us a much better understanding of its meaning and history than has been available before." (Alois Pichler, Journal for the History of Analytical Philosophy, Vol. 4 (3), 2016)