Abstract: The present invention is directed to a spherical device 100 is equipped with a central or para-central cavity 102, which passes through entire volume of the spherical device 100. In the illustrated configuration the central cavity 102 is circular in dimensions. However, those skilled in the art will recognize that other cavity configurations are applicable to the present invention. The spherical device 100 is further equipped with an opening 104 which extends from the poles of the spherical device to the central cavity to bisect one hemisphere of the spherical device 102. As a result, the spherical device 100 includes two faces 106 and 108 which are separated by the opening 104.