This is the answer to a sentence correction problem from Knewton.The web hanging from the rafters on the ceiling was beautiful, elaborately spun by a black widow spider.
The explanation says that it is correct because "elaborately spun by a black widow spider" is set off by a comma at the end of the sentence, so it correctly modifies the subject of the sentence, "the web."
If 'elaborately spun by a black widow spider' modifies the noun 'the web,' then isn't it an adjective modifier? And if so, doesn't it have to TOUCH the noun it modifies?
I don't understand how this sentence is correct, can someone please clarify?