A micro-wilderness comes alive to its "viewers" along a unique trail in Colorado's White River National Forest, through the senses of smell, touch, hearing, even taste—all the senses except sight. The Roaring Fork Braille Trail is a sell-guiding nature course which winds for a quarter of a mile through dense spruce and fir forests. It allows the blind to learn about a part of the natural world often denied to them. By following a nylon cord to the 23 stations printed in braille along the trail, the blind person learns about plant, animal and rock forms in the area.

The "viewer" will hear the sounds of a tumbling mountain stream, listen to the wind and birds in the trees and bushes; feel annual rings in a stump, the shape of a flower, lichens on a rock, pine needles or sphagnum bog underfoot; smell the balsam and the fir; bite a twig or a leaf.

Q. Underline the sentence which describes how visitors find their way along the trail.