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
https://kibarlar.sharefile.com/d/s8ef8771f1df44ad8

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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