In China, Warring States (sengoku)-era (475-221 B.C.), soldiers have some tonbodama (with eyes) as a good luck charm.
Spherical type: Ellipsoid type, Cylinder type, Bicone type, Square type, Tabular type, Crescent type
Eye type: Simple eye, Stratified eye, Double layers, Multiple layers, Compound eye, 22.214.171.124.7.8 stars, Concentric circle, Eccentric circle, Non-eye-design
Sengokodama necklace, all are made to order