Hyperstreamlines, developed by Lambertus Hesselink and
Thierry Delmarcelle, are defined by the three principal eigenvectors
of a symmetric second-order tensor. The major eigenvector gives
the direction of the hyperstreamline and the two minor eigenvectors
define its diameter.
A comparison between hyperstreamlines and tensor ellipsoids is
shown in image 13.

Hyperstreamlines can also by defined for
unsymmetric second-order tensor fields.

The picture shows the reversible momentum flux density tensor in the flow
past a hemisphere cylinder. The colour gives the kinetic energy density.