Focus on this artwork and explore the Construction.
The Monolith was fabricated by Louie Raffloer at Seattle's Black Dog Forge. It was a hollow structure measuring 1 by 4 by 9 feet (0.30 m × 1.2 m × 2.7 m), the same proportions as the  Monoliths of the "Space Odyssey" series. It was constructed of 16 gauge steel and L-beams. Rebar protruded from the bottom to attach the Monolith to its foundation. Estimates on the weight ranged from 350 to 500 lb (160 to 230 kg). The foundation, consisting of 4 steel tubes connected by rebar, was buried in the ground and embedded in concrete. When the Monolith was erected, quick set epoxy was poured into the tubes and the rebar on the bottom of the Monolith was inserted into the tubes.
Rebar Seattle  Monoliths of the "Space Odyssey" series concrete epoxy Monolith