Except during totality, we never look at the sun. But what if you’ve forgotten a filter? You can still watch by making a pinhole camera. It can be as simple as two pieces of paper with a tiny hole in one of them. Try to make the hole as round as you can, perhaps with a pin or a sharp pencil. Line up the two pieces with the sun so the one with the hole is closest to it. The pinhole will produce a tiny image, which you’ll want to have land on the other piece of paper. Moving the two pieces farther apart will enlarge the sun’s image but will also lessen its brightness. Also, a number 14 welder’s glass is another way to safely observe the sun anytime.