§ 2. _Perceptual Space and Time._ Both space and time, as we are aware of them in immediate perception, are (1) _limited_. The space we actually behold as we look out before us with a resting eye is always terminated by a horizon which has a more or less well-defined outline; the “specious present,” or portion of duration of which we can be at any time aware at once as an immediately presented content, has been shown by elaborate psychological experimentation to have a fairly well-defined span. Whatever lies outside this “span of attention” belongs either to the no longer presented past or to the not yet presented future, and stands to the sensible present much as the space behind my back to the actually beheld space before my eyes. Of course, in either case the limits of the actually presented space or time are not absolutely defined. To right and left of the line of vision the visible horizon gradually fades off into the indistinctly presented “margin of consciousness”; the “sensible present” shades away gradually at either end into the past and the future. Yet, though thus not absolutely defined, sensible space and time are never boundless. (2) Perceptual space and time are both internally _sensibly continuous_ or unbroken. Concentrate your attention on any lesser part of the actually seen expanse, and you at once find that it is itself an expanse with all the characteristics of the wider expanse in which it forms a part. Space as actually seen is not an aggregate of _minima visibilia_ or perceptual points in which no lesser parts can be discriminated; so long as space is visually or tactually perceived at all, it is perceived as containing lesser parts which, on attending to them, are found to repeat the characteristics of the larger space. So any part of the “specious present” to which special attention can be directed, turns out itself to be a sensible duration. Perceived space is made of lesser spaces, perceived time of lesser times; the “parts” not being, of course, actually distinguished from each other in the original percept, but being _capable_ of being so distinguished in consequence of varying movements of attention.