Grid pattern
Do you remember the first digital camera's? They used to have digital zoom. And I'd explain to everyone that digital zoom is as useful as having no zoom at all. With digital zoom you're just throwing away pixels, not adding details.
Well these days things are a bit different. Camera's still have digital zoom of course. But with a 12 megapixel camera you have so many pixels that you can easily afford to throw away a million or two. So digital zoom is effectively buying you an almost microscope like view of the world.
So I tend to make photo's of ever more everyday objects. Like of this butter tub at our breakfast table. If you zoom in close enough, it turns out that there is this mesh pattern on the side. Why would that be?