“a swirling mass of sth”?

Does “a swirling mass of sth” describe things in disorder or things arranged in a spiral way? I guess the former make sense but I am not sure. Could you help? Example: You can literally see the result 1,000 miles (1,600 km) west of San Francisco in the Great Pacific Garbage Patch, a swirling mass of plastic... show more Does “a swirling mass of sth” describe things in disorder or things arranged in a spiral way? I guess the former make sense but I am not sure. Could you help?

Example: You can literally see the result 1,000 miles (1,600 km) west of San Francisco in the Great Pacific Garbage Patch, a swirling mass of plastic debris twice the size of Texas.

Thanks!
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