I'd have to be really quick to describe clouds - a split second's enough for them to start being something else. Their trademark: they don't repeat a single shape, shade, pose, arrangement.

The counting of weekdays would inevitably seem to be a senseless activity; dropping letters in the mailbox a whim of foolish youth; the sign 'No Walking On The…

They aren't obliged to vanish when we're gone. They don't have to be seen while sailing on.

For the sake of research, the big picture and definitive conclusions, one would have to transcend time, in which everything scurries and whirls.