The big bug grid is just a large black beetle that landed on my black plastic window screen, a sort of grid, one day earlier this month.
The Fall brings all sort of insects we don’t normally see the rest of the year, that are preparing to find some place to hibernate for the coming very cold Winter months.
This large insect just happened to land on my window screen so I took a picture of it. It appears some sort of beetle and it wandered around my screen surface for a while and then just flew off or perhaps one of the spiders that populate the outdoors around the house got it when it got tangled in its web. Then again, it may have just died off when because of the cold that arrived very soon after I saw it.