A golf ball mold comprises an upper portion and a lower portion. The systems and methods employ a novel combination of a small sensor device embedded in a Luer cap and capable of wirelessly transmitting data to a reading device. The AP may operate in various modes that, for example, may provide directional information to other apparatuses as part of a general broadcast or in response to messages requesting directional information that are received from other apparatuses. The cover of the transceiver is also assembled by the snap-in without using screws and so on. The present invention also relates to modular structures like buildings produced using said structural members. Light is made incident on a diffraction grating so that specular resonance can occur in two or more light scattering units including, for example, bispheres, and by the specular resonance, a fraction of diffracted light 52 that is diffracted by the first layer and the second layer is selectively enhanced.