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Another possible view is that every major feature of the program, core concern (business logic), or cross-cutting concern (additional features), is an aspect, and by weaving them together, you finally produce a whole out of the separate aspects.
The prism analogy describes aspects with terms from the domain of light. Like splitting light into its many aspects (different colors) with a prism, you split a problem into its separate aspects. With another prism you can put the different colors back into a white ray of light, and by the process of weaving aspects you can put your solutions for the different aspects of a problem back into a solution for the whole problem.