Isotropy means uniform distribution over an area. A husband and wife sleeping in bed, equally sharing the blanket is a wonderful example of isotropy. But perhaps your wife is a blanket hog or the husband gets too cold too easily. Then one side of the bed has much more blanket than the other side. This is anisotropy, or cold feet.

Another example would be using a picnic. Now suppose the family picnicing has a bunch of wonderful food. The ants would be equally spread about on their picnic blanket annoying the wife, husband and their two kids. This is isotropy. But suppose that the husband loves head cheese sandwiches. The ants wouldn't like that, so they wouldn't bother the husband. Rather, they would gather around only the wife and the two kids. This is another example of anisotropy.

I could come up with 2000 of these. Its fun. Understand now?