On one of my hikes I once came to a valley. In the middle of this beautiful valley flowed a narrow stream that shone silver.

There were two meadows to the left and also to the right of the stream. To the left a herd of dark sheep grazed. Brown-furred sheep with black lambs. In the meadow to the right, all the sheep were white. And in the middle of the stream, there stood a magnificent tree.

One half of the...