Shimmering

We had visitors this morning so rang all ten bells. The ringing was as good as we have managed this year with very clean striking. We were told it sounded very good in the village. I returned home to write up and circulate the minutes from yesterday's meeting. Otherwise, I rested in the afternoon as I have another match to play this evening. The forecast is for possible light rain so the match could be postponed. I have set a little optical puzzle with the photo . Perhaps you can identify it.