Joyous Gard by A.C. Benson

A friend of mine had once a strange dream; he seemed to himself to be walking in a day of high summer on a grassy moorland leading up to some fantastically piled granite crags. He made his way slowly thither; it was terribly hot there among the sun-warmed rocks, and he found a little natural cave, among the great boulders, fringed with fern. There he sate for a long time while the sun passed over, and a little breeze came wandering up the moor. Opposite him as he sate was the face of a great pile of rocks, and while his eye dwelt upon it it suddenly began to wink and glisten with little moving points, dots so minute that he could hardly distinguish them.

Suddenly, as if at a signal, the little points dropped from the rock, and the whole surface seemed alive with gossamer threads, as if a silken, silvery curtain had been let down; presently the little dots reached the grass and began to crawl over it; and then he saw that each of them was attached to one of the fine threads; and he thought that they were a colony of minute spiders, living on the face of the rocks. He got up to see this wonder close at hand, but the moment he moved, the whole curtain was drawn up with incredible swiftness, as if the threads were highly elastic; and when he reached the rock, it was as hard and solid as before, nor could he discover any sign of the little creatures.