TITLE: Reference for Manin's idea on algebraic geometry over the symmetric monoidal model category of Motives
QUESTION [11 upvotes]: Reference for Y. Manin's idea of "algebraic geometry over the symmetric monoidal model category of motives."
Has been sugested to me that this was made in a Manin's letter. There is an escaned copy?
Some work in this direction has been made in the thesis of Spitzweck, but I refer to first references of Manin.

REPLY [5 votes]: Not really an answer, but as a complement to Myshkin's, let me just mention a predecessor : Deligne's very famous (and magnificent) article
Deligne, P. Le groupe fondamental de la droite projective moins trois points.
available here
especially the two paragraphs 
§5  Géométrie algébrique dans une catégorie tannakienne
§7  Géométrie algébrique dans la catégorie tannakienne des systèmes de réalisations: interprétations