Mono Monday: Week 285 ....

... unexpected reflections.

I thought I was going to be bliptwins with Shelley (see extra!) but then I saw this unexpected reflection on the deck!  Can you guess what it is?

My apologies for yet another late entry to the MM challenge. I managed to backblip a couple of March vacations pictures (here and here) but then ran out of time on Tuesday to post this one and Tuesday's .... which will soon be up.