What is symbolized by the repeated incidences of images of blood, sheep, and darkness in the tragedy of macbeth

The blood symbolizes murder and death, the darkness symbolizes evil, like murder. It can also symbolizes good and evil, guilt and innocence. The sleep symbolizes innocence, purity, the peace of mind.

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onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.