«والشمس كالمرآة في كف الأشل»
The sun is like a mirror in the hand of someone whose hand trembles.
The comparison is more than the roundness of the sun or the brightness of a mirror. The imagined movement, shimmering and shifting visual appearance contribute to the image as a whole.
The source treats such formations as composite when motion combines with shape, light or another characteristic to produce a unified perceptual impression. A full analysis first recognizes the elements and then explains their combined rhetorical effect.