Abstract: A tapered hexagon building block and a method for building spherical and hemispherical structures from the building block disclosed. The building block can have both a male and a female element for use as an interlocking mechanism for added strength and fitting guidance during construction. The block can be sized for use both as a toy and for use in building temporary or permanent spherical and hemispherical structures. The blocks can be composed of any suitable building material such as the group composed of glass, wood, metal, plastic, quartz, sand, ceramic, clay, brick, concrete, carbon, compressed soot, or any other such building material suitable for the use of the specific structure. The block can be solid or hollow and can be made of any clear material with thin walls to promote the passage of light or solid and opaque to block the passage of light.