Photo op it may be, but I think the lines in the grass are clippings, because the lawn mower has no collection bag.
Not clippings, look closer, it is a 2-3" row of uncut grass.
Mower does not have a discharge chute, must be a mulching mower. Clippings with or without a discharge chute do not get piled in a row, they are spread evenly and in case of a mulching mower hardly noticable unless the grass if real high.