DynaOptics announces its Kickstarter fundrasing campaign for the OOWA rotationally asymmetrical lens:
"A lens that is rotationally asymmetrical does not look the same after you turn it around it’s center point. The number of positions in which the object looks exactly the same is called the order of the symmetry. In OOWA, we are using second order symmetry.
Due to the second order symmetry in our free-form lenses, we are able to optimize image quality in a rectang ular shape, mapping this high-quality image space onto the rectangular sensor."