Tea bowls are literally full of nature. I think of them as having something in common with valleys or deep hollows. Summer tea bowls are more open so the tea will cool faster, while winter bowls tend to have steep sides. After tasting a bowl of bright pea green matcha tea for the first time, a guest remarked, “It tastes like drinking a meadow.”
While a potter shapes clay and applies glazes to make a tea bowl, there is always a collaboration with natural forces. Kiln fire and heat will have their say. If I was stuck in an ugly part of a city, drinking tea from a lovely tactile bowl would certainly be an appropriate compensation. Tea bowls come in endless variety. Here are a few examples:
Radiant Refuge 