a smooth curve of the channel of the colorado rive, air force, america, arizona, california, canyon, dollars, f35, federal, fighter, flag, forest, glen canyon, horseshoe, horseshoe bend, jackson, lighting, lights, malaysia, moscow, moscow state university, night, note, reserve, river, road, san francisco, sea, ships, singapore, sky, snow, square wave, states, the prairie, town, united, united states, war, washington, waves, wind, winter