Skew-lens image rotator

We construct combinations of three skew ideal lenses whose mapping between object and image space corresponds to a rotation of the object space around a common intersection line of all included lenses. The angle of image rotation Δ θ can be set arbitrarily within a range (0, 2 π ) by tuning the parameters of the lenses. The resulting skew-lens image rotator could form the basis of novel applications, e.g. simulating curved spaces.