This video series visualizes tensors using a unique and original visualization of a sphere with arrows.
Part 1 introduces the concept using the Cauchy stress tensor.
Note that this series talks about the term 'tensor' as used in physics and math. In the field of AI the term 'tensor' was borrowed with a simplified meaning. In AI it simply means a multi-dimensional array. So for example the array "double a[4][6]" (4 by 6 matrix of doubles) is called a second-order tensor, but there's no special relationship to vector spaces, as shown in the video.