Sphere with hole

I placed a Sphere primitive and I deleted several faces from it.
I painted it .
I expected to see when I am looking from outside into the hole the faces of the sphere of the opposite side.

here link

In 3D, polygons (faces) are usually rendered single sided, for performance reasons. In the “Advanced Options” for materials you can set the material to be double-sided, then apply the material to the object.

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