Abstract: A system and method for natural light illumination of residential and commercial buildings. A tubular skylight, the system comprises a highly reflective tubular body positioned in the space between a building's roof and ceiling with a first end with a supporting lip attached to a roof assembly, and a second end attached to a ceiling assembly. The roof assembly further comprises a semi-spherical transparent globe and a molded roof mount with a tapered sleeve. The ceiling assembly comprises a semi-spherical, light diffusing cap and a molded ceiling mount with a straight sleeve. In a preferred embodiment of the system, the first end of the tubular body is inserted through the tapered sleeve and supported therein by a right angle supporting lip and the second end of the tubular body is positioned over the sleeve of the ceiling mount.