[JasonFruit]

I have always seen it this way too: a broken or completed circuit. But I've accepted that my initial understanding of the visual metaphor doesn't match its intent. I think misunderstandings like these result when we abandon written language to point and grunt at tiny pictures.

[jaywalk]

I've always looked at the line as a connection and the open circle as no connection. It's just what I came up with when I was young as a way to make sense of the markings.