When you watch 3D at home with "Active" 3D Glasses. There is an emitter built into or attached(Sony) that sends a signal to the glasses. The signal is essentially telling the glasses what rate to shutter at(over 100 times per second). The shutter effect manipulates the eyes to the point where only one eye is being used at a time. So if you can only see out of one eye you do not get the 3D effect. While those who claim to only be able to see out of one eye at a time but have equal vision from both will still get the effect. Possibly an enhanced 3D effect(IMO).
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By definition a sphere is 3D. If it were only 2D it would be a circle.
A flat-faced brick.
a rectangle in 3D A brick shape.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
Humans eyes are a little distance from one another and so they see slightly different images. These two images are reconstructed by the brain so that things look three dimensional. 3D films such as Avatar have two images on the screen and the colours are such that one image is seen by one eye through the special glasses and the other by the other eye. Each image is just slightly different to the other and the effect on the human is a 3D image.