DIY hologram using a 4-sided pyramid

Here's an easy to make hologram, one that shows four sides of an object.

Princess Leia hologram and R2D2.
Princess Leia hologram giving here message to R2D2 as in the 
      scene from Star Wars IV.
A flying pterodactyl hologram.
A flying pterodactyl hologram.

It's made by taping together four pieces of plastic to make a truncated pyramid as shown below. On a screen such as a phone, tablet or monitor, display an image or animation that consists of four different views of the same object. Sit the pyramid in the middle and when you look at it from the sides, you'll see the image closest to you projected onto the closest face of the pyramid. And since the pyramid is transparent the image will look like it's suspended in air.

The plastic pyramid.
The plastic pyramid for showing holograms.
Animation on a monitor.
Animation of images on a monitor for displaying a hologram.
Putting the pyramid in place.
Putting the pyramid in place for displaying a hologram.
Image projected up to one side.
One side of the flying pterodactyl hologram.

Note that strictly speaking, this isn't actually a hologram. A hologram refers to a thing created using a specific process and involves the "use of laser, interference, diffraction, light intensity recording and suitable illumination of the recording" [from wikipedia]. This pyramid "hologram" is really 4 views using a trick called Pepper's Ghost, the result being something that is popularly known as a hologram.

I've also shown how you can have fun doing Pepper's ghost using a smartphone and a video of some ghosts and an animation of some Star Wars AT-AT Imperial Walkers.

Hologram images to play with

Here are some animations and a still image I've made that you can download and use yourself. Just make your own plastic pyramid and have fun. With some browsers you can just click on the file and you'll be asked to save, with others you may have to right-click and choose to save.

Princess Leia giving here message from Star Wars IV - animation

leia_hologram_h264.avi - 531KB, H.264 video format

leia_hologram.blend - 3.11MB, contains the 3D model and animation for use in Blender, made with Blender 2.71.
If you make a video or do something awesome with this, please let me know (email address is below.) Also, if you make significant modifications to the .blend file, I'd like to have a copy of the resulting .blend file for my own use.

Flying pterodactyl - animation

pterodactyl_hologram_h264.avi - 325KB, H.264 video format

Skull - still images

skull_hologram.mp4 - 168KB, video

skull_hologram.jpg - 29KB, still image file

Video - Pyramid Hologram - How to Make/How it Works with Princess Leia Hologram

The following video shows the above hologram in action, including the Princess Leia and R2D2 one, the pterodactyl and the skull, as well as making a plastic pyramid.
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