a fleeting moment

The great significance of [the artwork] lies in its presentation of a particular moment. If [an artwork] is to convey to the viewer a sense of real movement, it has to portray a fleeting moment. We are convinced that no part of the whole was in its present position just prior to this instant, and that no part will be in the same position just afterwards. If this is so, [the artwork] will forever be a living image for countless millions.

-Goethe, Essays on Art and Literature