Abstract: Three-dimensional structure is provided that includes an internal structure and an external structure configured to receive the internal structure. The internal structure includes a plurality of walls forming an accommodation opening and a magnetic element configured to be affixed or located within on the plurality of walls. The external structure includes a set of two surfaces having a first configuration of protrusions where the two of two surfaces are adjoining. Another set of two surfaces have a second configuration of protrusions, where the surfaces form at least one opening configured to allow insertion and removal of the internal structure. The set of two surfaces and the another set of two surfaces are configured for mating engagement with another external structure having substantially the same configurations, where the first configuration and the second configuration are configured to couple to each other.

Abstract: Display case is provided that includes an upper portion and a lower portion. The upper portion has a rim defining an opening, a substantially cylindrical portion extending from the rim, and a curvilinear portion extending from the substantially cylindrical portion and terminating in a substantially flat portion. The lower portion includes a first surface having a first receiving portion formed therein, a sealing surface extending from the first surface and configured to be inserted into of the opening and engage with the substantially cylindrical portion, and a second surface opposite the first surface which forms a second receiving portion. The first receiving portion and the second receiving portion are substantially the same size and configured to receive a base of a toy.

Abstract: Three-dimensional structure is provided that includes an internal structure and an external structure configured to receive the internal structure. The internal structure includes a plurality of walls forming an accommodation opening and a magnetic element configured to be affixed or located within on the plurality of walls. The external structure includes a set of two surfaces having a first configuration of protrusions where the two of two surfaces are adjoining. Another set of two surfaces have a second configuration of protrusions, where the surfaces form at least one opening configured to allow insertion and removal of the internal structure. The set of two surfaces and the another set of two surfaces are configured for mating engagement with another external structure having substantially the same configurations, where the first configuration and the second configuration are configured to couple to each other.

Abstract: Display case is provided that includes an upper portion and a lower portion. The upper portion has a rim defining an opening, a substantially cylindrical portion extending from the rim, and a curvilinear portion extending from the substantially cylindrical portion and terminating in a substantially flat portion. The lower portion includes a first surface having a first receiving portion formed therein, a sealing surface extending from the first surface and configured to be inserted into of the opening and engage with the substantially cylindrical portion, and a second surface opposite the first surface which forms a second receiving portion. The first receiving portion and the second receiving portion are substantially the same size and configured to receive a base of a toy.