<http://schema.org/caption>
"The sound energy forms a 3D acoustic bottle of high-pressure walls and a null region in the middle \u2013 pressure field at bottom shows self-bending ability of the bottle beam to circumvent 3D obstacles, while dashed arrows indicate wave front direction (Image: Xiang Zhang group/ UC Berkeley)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/acoustic-bottle-beams-imaging-cloaking-levitation/33231/>