The darkness comes

I get home about eight o'clock these days, which is - quite suddenly, and unexpectedly - around dusk. This means that the balance in my eyes between cones and rods starts to shift, so that although I can still pick out shapes well, only quite bright colours are obvious - sunsets, for instance, are all the more vivid, and so quite beautiful.

Of course, the same thing is happening to other people, which means I really should start using lights when I cycle home.