大般涅槃經疏 31.8

31.8

From "Again, there are those who say..." onward is the third, refuting [the view that] space is sequential. Saying "sequential" refers, for example, to [looking] through the pipes of a flute or inward through a door. The Abhidharma masters say: When looking from inside a window at the space outside, one first sees it through the first window lattice, and then sees it through the second and third; this is sequential. This also first cites it and then refutes it.