• lud@lemm.ee
        link
        fedilink
        English
        arrow-up
        2
        ·
        1 year ago

        Depends on how you see it, a hole or a tube. I prefer a hole.

        A common joke is that a topologist can’t see the difference between a donut and a coffee mug because you can mould a mug into a donut (assuming it has a handle).