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Bulls, for instance, cannot see the red color of the cape of a bullfighter, but they are agitated by its movement.Today modern darkrooms usually use an amber safelight.
A Visitor Center provides exhibits on the geology, ecology, prehistory and history of the park and nearby region.Several cactus species, including beaver tail and cholla, are also common.The springtime bloom of such plants as the desert marigold, indigo bush, and desert mallow are often spectacular along park roads.Camping: There are two campgrounds with a combined total of 72 units. A camping limit of 14 days in a 30-day period is enforced.Campsites are equipped with shaded tables, grills, water and restrooms. RV Camping: RV sites with power and water hookups are available.The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide.
Iron oxide also gives the red color to the planet Mars.
Hiking: Many intriguing hikes are available to visitors.
Inquire at the Visitor Center for suggestions on day hikes of varying length and terrain.
Modern surveys in the United States and Europe show red is also the color most commonly associated with heat, activity, passion, sexuality, anger, love and joy.
In China, India and many other Asian countries it is the color of symbolizing happiness and good fortune.
In the language of optics, red is the color evoked by light that stimulates neither the S or the M (short and medium wavelength) cone cells of the retina, combined with a fading stimulation of the L (long-wavelength) cone cells.