An edge with a surface area would require depth. Where is the silver lining of a point "cloud"? You only get sides when you abstract, and you can only guild when you have sides.
Exactly: the *abstraction* of a cloud (it being an ominous thing, with non-silver sides) is what we imagine has a silver lining: the physical cloud itself has no sides, and no lining.
Not if the sun isn't shining on it. The analogy and correlation is that of our awareness and consciousness shining light on our life situation, which might be very cloudy indeed.