How 3D Works: a simple guide with or without glasses

I know you were curious on this emerging 3D technology that yesterday was just a dream but now seems to be a normal thing we see on cinemas, in our home LCD TV (Sony Bravia, Vaio, Bluray and PS3 3D compatible) and even in our computers (like the Acer Cinereal, a laptop with 3D support). So basically, we were asked how 3D effects work. Learn things at the image above and let me know how do you feel after you read the picture guide.