When you create 3D you add depth to images and this depth makes the image looks real. The 3D retro effect looks like what you would see if you looked at an old 3D movie without the 3D glasses.

Photoshop CS6 Extended tutorial showing how to make interlocking, 3D gold rings from scratch. If 3D isn't working: Only available in EXTENDED versions. Windows XP doesn't support 3D. Video card may ...