Can bubble rings be created in any shape besides a circle?
Well not really. It is possible to create slightly mis-shapen bubble rings, such as an elongated oval, but the perfect circle shape is the one that lasts the longest. Dolphins sometimes create bubble rings that travel sideways through the water, instead of up towards the surface, and these bubble rings are sometimes more like arches, with most of the air appearing at the top part of the ring, and the bottom part of the ring partially or completely missing.