1. Philosophische Bemerkungen. Philosophical Remarks (PR), ed. R. Rhees, B. Blackwell, Oxford 1964. Trans. by R. Hargreaves & R. White, B. Blackwell, Oxford 1975.
2. The two short commentaries dedicated to the Philosophische Bemerkungen do not treat the topic I am concerned with here. N. Malcolm gave a survey of the fundamental themes of the Bemerkungen in ‘Wittgenstein’s Philosophische Bemerkungen’, Philosophical Review,76, 1976, pp. 220–229 by underlining above all the connections with other works by Wittgenstein. He does not mention Wittgenstein’s interest in visual space. H. Spiegelberg also commented on the Bemerkungen: ‘The Puzzle of Ludwig Wittgenstein’s Phänomenologie’, American Philosophical Quarlerly,5, 1968, pp. 224–256, but from a metaphilosophical point of view. These two articles have been re-edited in Ludvig Wittgenstein: Critical Assessments,ed. by S. Shanker, Croom Helm, London 1986, Vol. I, pp. 213–221 and 222–240.
3. For this reason the following paragraph, concerning the two stars which pivot around each other is irrelevant, since it concerns relative movements.
4. A possibility envisaged by Husserl. See Ding and Raum. Vorlesungen 1907,ed. by U. Claesges, M. Nijhoff, The Hague, 1973, Abh.B. ‘Stufen der Raumkonstitution’, pp. 309–321.
5. Gefühlsraum. It is precisely that which in the context of the present essay I called orientation space.