Toggle the rank of A. The
solid in the domain is
mapped to the codomain by v ↦ A·v.
Drag the ● tip to choose a vector v (domain);
its image A·v appears in the codomain.
rank 3 fills space; rank 2 collapses the solid onto a plane
(the image); rank 1 collapses it onto a line.
Drag the background to orbit · scroll to zoom · axes labelled x, y, z.