straight up
And nobody remembers why we called it a mouse, but anyway, from there on, that's what we used.
The first mousewith button and tracking wheels

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Click to play video About the first mouse

Mouse <1965>
So anyway – so if you're going to use a display, how do you select things off the screen? So there was a lot of argument about light pens and everything else. So we set some experiments up. And I got an idea and it turned out to be the mouse. I mean, this was the first one: about three inches by two inches or something like that, and a couple of disks on the bottom that roll around on a surface like that. And that's what you did your clicking with.

And we set that up with a bunch of experiments and it kept winning. And we all knew that when display working computers really get serious, it's going to go.