I am a brain, Watson. The rest of me is a mere appendix.

I had hardly expected so dolichocephalic a skull or such well-marked supra-orbital development. Would you have any objection to my running my finger along your parietal fissure? A cast of your skull, sir, until the original is available, would be an ornament to any anthropological museum. It is not my intention to be fulsome, but I confess that I covet your skull.

I know, my dear Watson, that you share my love of all that is bizarre and outside the conventions and humdrum routine of daily life.

Excellent!" I cried. "Elementary," said he.

Let me see. What are my other shortcomings?

At the moment our human world is based on the suffering and destruction of millions of non-humans. To perceive this and to do something to change it in personal and public ways is to undergo a change of perception akin to a religious conversion. Nothing can ever be seen in quite the same way again because once you have admitted the terror and pain of other species you will, unless you resist conversion, be always aware of the endless permutations of suffering that support our society.

The grand thing is to be able to reason backwards.