 In addition to various notions of epistemic possibility, philosophers have been concerned with three particular notions of possibility that are generally regarded as non-epistemic: logical possibility, metaphysical possibility, and physical possibility. On one common view, the physical possibilities are a subset of the metaphysical possibilities, which in turn are a subset of the logical possibilities. (But see Fine (2002) for an opposing view.) Here are a couple of examples of things that are logically possible but neither metaphysically nor physically possible: the Eiffel Tower’s being red all over and green all over at the same time; the Eiffel Tower’s being red but not  extended.[1]  Here is an example of something that is logically and metaphysically possible but not physically possible: the Eiffel Tower’s traveling faster than the speed of light. The Eiffel Tower’s being both red and not red at the same time is possible in none of the senses while its traveling faster than a speeding bullet is possible in all of them.