The word SHADE refers to the senses: sight and touch.
Explanation:
We cannot taste, smell or hear a shade. There are only to possible ways, for us humans, to sense it. First, we can see it. We can clearly tell the light under a tree or inside a house is different than the light outside, without any leaves or roofs for cover. We can also "feel" the shade in the sense that the temperature is different under a shade. It feels cooler, for instance, to stand under a tree on a sunny day.
