I was paying bills by Credit card on Friday for my parents when I thought of a pretty weird idea.
Most of you who either have a credit card or seen one know that credit cards have holograms on them for authenticity purposes and what not. A hologram is really a flattened version of a 3d object. When you look into a hologram you can see depth and other features of a 3-dimensional object.
A hologram can reflect a 3-dimensional object without taking on the size of a 3-dimensional object. If you stretch it to another level, what if our 3-dimensional world is really a 2-dimensional hologram? Or even more, what if our 3-dimensional world is 2-dimensional shadow of something with more than 3-dimensions?