The Chair in Philosophy: Heidegger

From Martin Heidegger's Being and Time, trans. John Macquarrie and Edward Robinson, Section I.II "Being-in-the-World in General as the Basic State of Dasein":

"There is no such thing as the 'side-by-side-ness' of an entity called 'Dasein' with another entity called 'world.' Of course when two things are present-at-hand together alongside one another, we are accustomed to express this occasionally by something like 'The table stands "by" the door' or 'The chair "touches" the wall.' Taken strictly, 'touching is never what we are talking about in such cases, not because accurate re-examination will always eventually establish that there is a space between the chair and teh wall, but because in principle the chair can never touch the wall, even if the space between them should be equal to zero. If the chair could touch the wall, this would presuppose that the wall is the sort of thing 'for' which a chair would be encounterable."