Grid, Measure
You see twenty slides lined up like a grid. You don't know who put them here, but they almost look like the grid paper you do your maths homework in. But who would use a slide as grid paper?
Picture twenty slides laid out in a grid system.
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As you stare at the slide grid you see some people come out and overhear them talk about their mass maths (ます) tournament happening later today. Oohhh it IS a giant grid. And they're going to use it to do maths later!
You can make a grid out of anything if you set your mind to it. And you can do math anywhere as long as you have some grid paper!