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What is your level of expertise in PS 3D?

What you need to have to do what you have in mind are two pictures:

- the first one is the normal background picture

- the second one the HDRI picture wich is a 360 degrees panoramic picture

You need to replace the standard IBL with the HDRI picture to have a seemless reflection in the sphere and reverse the view because the reflection you see in the front side of the sphere is actually the view of where you stand.

You can not have a reflection from the visible background but from the part facing the background. (Thats why you need a 360 degrees view picture)

You also need to adjust the shine and reflection of the sphere.

Free HDRI maps are available on the net