Additionally, curved building form was designed to relate to the fluidity of oil and break down the general rectangular floor plan.Ībbco Roofing Inc. There are two oil derricks at the casino’s main entrance. The casino was designed to be reminiscent of the time period from 1887 to 1906 because the first commercial oil well was drilled there in what would become Oklahoma. Cherokee Casino Ramona’s curved exterior required multiple metal panel profiles and shades.