A hidden image game piece and a method by which a hidden image game piece is produced. Restricted access points can lessen restrictions to allow devices to register with the restricted access point for providing measurements thereto. The substantially spherical explosive charge has a substantially spherical surface. The compounds may be useful towards other biological targets involving protein-protein interactions. Once a client has received all data blocks comprising the content for the session, the client may exit the ongoing session. Further, these walls incorporate a ground plane within this same substrate, which allows for the realization of such structures on a single substrate for microstrip devices, and for realization of stripline structures utilizing only two substrates.