Assuming LISA does find graviational waves in the future, is there any way in theory to focus these gravitational waves? I know that gravitational lensing of distant galaxies can focus their EM spectra as in the Abell clusters, but can this same gravitational lensing be achieved on gravity itself? Or any other devised manner in theory? Also, this brings us to an idea I thought of where there may be local areas of space that exhibit a pocket of abnormally high gravity from a specific direction in space. Of course this hinges on the above questions, so if anything its just an interesting fictional idear.