Einstein rings exist, too. A cross happens when the lensing object has a certain shape and orientation. https://en.wikipedia.org/wiki/Einstein_ring https://en.

Einstein rings exist, too. A cross happens when the lensing object has a certain shape and orientation. https://en.wikipedia.org/wiki/Einstein_ring https://en.wikipedia.org/wiki/Einstein_ring https://en.wikipedia.org/wiki/Einstein_Cross https://en.wikipedia.org/wiki/Einstein_Cross