This immediate duration is not clearly marked out for our apprehension.

Its earlier boundary is blurred by a fading into memory, and its later boundary is blurred by an emergence from anticipation.

There is no sharp distinction either between memory and the present immediacy or between the present immediacy and anticipation.

The present is a wavering breadth of boundary between the two extremes.

Thus our own sense-awareness with its extended present has some of the character of the sense-awareness of the imaginary being whose mind was free from passage and who contemplated all nature as an immediate fact.