For photographers (and mathematicians!), sunflowers are irresistible because of the patterns that the seeds make in the flowerhead. And as usual: patterns come out better if your eyes are not distracted by colours, so the second picture comes in black-and-white.
Harvest of the sunflowers. Most are to be kept for the birds, coming winter (if we are advised to feed them again; at the moment, because of a contagious bird disease, we'd better not stimulate their getting together). But birds don't wait: some of the flowerheads were already mostly eaten (first picture).