The discovery of photonic crystals 30 years ago in conjunction with research advances in plasmonics and metamaterials. has inspired the concept of decameter scale metasurfaces. coined seismic metamaterials for an enhanced control of surface (Love and Rayleigh) and bulk (shear and pressure) elastodynamic waves. These powerful mathematical tools of coordinate transforms. https://www.roneverhart.com/Herco-Clay-Guitar-Humidifier-p23607/