Tadpoles, knock and reflected light.
1. The shallow sunny part of the pond is now alive alive alive with tadpoles -- so numerous and so wriggly that we can hear them.
2. Out of sight, a woodpecker knocks.
3. After supper, I go down to do the bins in the alley along the bottom of the row. I'm startled to a halt by reflected sunlight bounced by a window that I can't see on to a wall that is normally only lit briefly at sunrise.