Abstract: A multiple rhombic dodecahedron puzzle includes a plurality of wooden puzzles arranged in a multiple rhombic dodecahedron. The multiple rhombic dodecahedron is equivalent to a cube formed by a plurality of rhombic dodecahedrons connecting to each other. Each of the wooden puzzles includes two unit elements. The two unit elements are connected to each other and are the same others. Each of the two unit elements has a plurality of surfaces. Each of the surfaces has a diamond shape or a triangular shape. Two of the surfaces which in the triangular shape are connected to each other in order to form a concave shape.

Abstract: A multiple rhombic dodecahedron puzzle includes a plurality of wooden puzzles arranged in a multiple rhombic dodecahedron. The multiple rhombic dodecahedron is equivalent to a cube formed by a plurality of rhombic dodecahedrons connecting to each other. Each of the wooden puzzles includes two unit elements. The two unit elements are connected to each other and are the same others. Each of the two unit elements has a plurality of surfaces. Each of the surfaces has a diamond shape or a triangular shape. Two of the surfaces which in the triangular shape are connected to each other in order to form a concave shape.

Abstract: A multiple rhombic dodecahedron puzzle includes a plurality of wooden puzzles arranged in a multiple rhombic dodecahedron. The multiple rhombic dodecahedron is equivalent to a cube formed by a plurality of rhombic dodecahedrons connecting to each other. Each of the wooden puzzles includes two unit elements. The two unit elements are connected to each other and are the same others. Each of the two unit elements has a plurality of surfaces. Each of the surfaces has a diamond shape or a triangular shape. Two of the surfaces which in the triangular shape are connected to each other in order to form a concave shape, and the surfaces are surrounded to form a closed space.

Abstract: A multiple rhombic dodecahedron puzzle includes a plurality of wooden puzzles arranged in a multiple rhombic dodecahedron. The multiple rhombic dodecahedron is equivalent to a cube formed by a plurality of rhombic dodecahedrons connecting to each other. Each of the wooden puzzles includes two unit elements. The two unit elements are connected to each other and are the same others. Each of the two unit elements has a plurality of surfaces. Each of the surfaces has a diamond shape or a triangular shape. Two of the surfaces which in the triangular shape are connected to each other in order to form a concave shape, and the surfaces are surrounded to form a closed space.

Abstract: A hexagonal prismatic packing puzzle is provided, which includes 18 different shapes of puzzles. Each of the puzzles is composed of a plurality of unit components and the puzzles can be pieced together into a hexagonal prism. The unit components are selected from a group consisting of a first unit component and a second unit component. The volume of the first unit component is larger than that of the second unit component. The packing puzzle does not have an only solution or a specific solution. A user may develop and improve the sense of space and the cognitive of geometric figures thereof. Further, the user may train ability to think in multiple ways and achieve edutainment in the process of thinking.

Abstract: A hexagonal prismatic packing puzzle is provided, which includes 18 different shapes of puzzles. Each of the puzzles is composed of a plurality of unit components and the puzzles can be pieced together into a hexagonal prism. The unit components are selected from a group consisting of a first unit component and a second unit component. The volume of the first unit component is larger than that of the second unit component. The packing puzzle does not have an only solution or a specific solution. A user may develop and improve the sense of space and the cognitive of geometric figures thereof. Further, the user may train ability to think in multiple ways and achieve edutainment in the process of thinking.

Abstract: A signal converter includes an interconnect interface, a FIFO set, which comprises a transmitter FIFO and a receiver FIFO respectively connected to the interconnect interface through a data bus, a parallel/serial converter connected to the transmitter FIFO and the receiver FIFO by two data buses respectively and kept apart from the FIFO set, and a serial I/O interface connected to the parallel/serial converter.