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How do you even cut a sandwich horizontally?? The slices of bread are alreadly separated from each other! On what reference do they consider the cutting plane?
Cutting a Sando corner to corner is considered diagonal. Cutting across the middle is considered horizontal in this context.
One creates two triangles, one creates two rectangles. This is from.a top down perspective.
It’s not very hard to understand when you see it
Cutting a sandwich ‘along the middle’ is still considered a vertical cut, just along a different plane. Same as cutting corner to corner. Vertical but on a plane that isn’t orthogonal to the major XYZ axes.
I said top down. That’s a 2d perspective