Higher level categories (concepts) can often only be accessed by their symbols.
A concept can be demonstrated motorically, but with considerable effort. In actuality these concepts are accessed most readily by their symbol. This is where language becomes the bridge to a new Universe!
At the percept level, we see stars as little pin points of light, some blue, some red and some white. At the concept level we see, as I mentioned before, other solar systems with other suns and worlds shrouded in a wind of deadly particles.
Without language this would all be denied to us. With language (and its associated concepts) we can see to the edge of space and time; know the history of the world and the Universe and foresee the future for billions of years to come.