User blog comment:Edwin Shade/A Question Concerning Cardinal Infinities/@comment-24920136-20171025011457/@comment-1605058-20171026200455

Yes, spin is somewhat of a good analogy. "Size" (or more precisely, "cardinality") has a technical (which doesn't mean difficult!) meaning which might not match one's intuition perfectly, but still is a very useful notion (which might be worth getting some new intuition for).