There's a 90-degree turn that sends many racers crashing into the wood walls and they barrel down toward a 16-foot-high banked U-turn that puts racers nearly horizontal.
The energy companies are increasingly focusing on horizontal and oil-directed drilling, which will in turn help lift the realized prices of tubular steel.
Prairie landscapes from 1927 turn a train and tall grain elevators into minimal vertical and horizontal strokes, while roiling clouds and the engine's rising smoke prefigure familiar abstract elements.