sure that their sandwiches will be cut in perfect harmony
Cutting sandwiches with much science with a single straight cut can you half a three ingredient sandwich with all components perfectly halved? There’s actually real science about this called the Ham Sandwich Theorem and the answer might seem obvious when you’re looking at a theoretical symmetrical sandwich, but in reality sandwiches are messy. However, Mass doesn’t care about messiness; it still works. It doesn’t matter what form the three ingredients have or how they’re positioned. Imagine a slice of bread in Munich, Germany; a slice of ham at a farmer’s market in San Francisco, USA; and a slice of cheese in a lunchbox on a plane to Indonesia. Although this might not be a sandwich in the classical sense, there is a single perfect cut that halves all three slices at once; we just need a very big knife!
And there’s more math: there’s always a perfect cut for a four-piece sandwich in a four-dimensional space, same for a five-piece sandwich in a five-dimensional space, and so on. Thanks, Maths! Now any multi-dimensional civilization can be sure that their sandwiches will be cut in perfect harmony.