Swizzling! (Or pandas DataFrame “reshaping” / “pivoting” / “(un)stacking”.)
Click and drag the i,j,k in the upper right to reorder. Refresh for random dimensions.
One can imagine more spreadsheety stuff, extending to 4D arrays and higher, and aggregating/slicing/collapsing/folding along different dimensions.
No, I’m not at all sure I’m using the term “swizzle” correctly. I don’t understand matrices.