The celestial sphere isn't something you see directly *in* the sky. It's a concept used to help us understand the apparent motions of stars and other celestial objects.

Imagine a giant, imaginary sphere surrounding Earth, with Earth at its center. We project the positions of stars and other celestial objects onto this sphere. This helps us visualize how the sky appears to move around us.

So, while we don't see the celestial sphere itself, we observe its effects in the apparent motions of celestial objects.