Mike, I do the same thing, comparisons, sometimes they may be a stretch but it is the idea of similarities that strike me. In my line of work, construction I have to climb ladders, a lot. I find myself thinking climbing this ladder is like swimming, the only thing missing is the glide. X-country skiing is another similar comparison, but it has the gliding sensation.
And one parting and very deep comparison, space and time, the quantum effect. Can we swim through a brick wall?