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[Colorful trees seen from a chairlift overlooking purple and gray mountains in the background.] For many of us, visiting a national or state park is a visual experience. We watch the leaves change in the fall, look for colorful wildflowers, take in a sunset, or admire the different shades of a mountain landscape. But what happens when some of those colors are difficult to distinguish? For people with color blindness, some of the colors that make an outdoor experience memorabl