I have just few questions about altpicapion of the same concept /method in case of elastic wave , because there appeared many papers concerning this but is it possible for elastic waves which are mechanical waves caused by disturbing the medium as compared to EM waves which have there own fields and in the case of an EM wave, object getting cloaked for external EM waves rather nothing related to the object participation but only interaction with EM waves. If we consider Elastic waves this is due to the just the propagating wavy deformation and nothing called actual wave and both the participant and creator are the same so how can is it possible to cloak for the elastic waves. One way to do is just by modifying mechanically medium properties like (a few) higher damping, creating inclusions to reduce stress concentration etc. which indirectly means cloaking the effect from the material next to the modified one.