An I3DG is a device used to reflect 3 layers of images one infront of each other creating a "half" holographic effect. This is what the I3DG does:

http://www.youtube.com/watch?v=XySzOVmb05U

http://www.youtube.com/watch?v=na-R4rZkzH0

http://www.youtube.com/watch?v=hCYMDKywGGk

This is a quick and easy guide on how to build one.

All you need is 2 CD cases and a small amount of acrylic plastic.

Step 1: Measuring the Plastic

Copy and paste the image into word. Resize the image so the edges of the image are at the corners of the page. Do not crop the image.
Place on page like showen under this text.

Place a sheet of Plastic acrylic on top of the template below and use a pen to mark out key points at the corners. You only need to mark out the top 2 lighter gray shapes.

Place a Cd case on top of the template below and use a pen to mark out key points at the corners. You only need to mark out the top 3 darker gray shapes.

Step 2: Cut the Plastic

Saw around the outside of the shapes. Be careful when you saw the rectangles out as the CD case may brake. Once all of the shapes have been cut out, carefully smooth the corners.

BE CAREFUL NOT TO SCRATCH THE CD CASES AS THIS MEANS THE EFFECT DOES NOT WORK. IF YOU LOOK AT THE PICTURE BELOW THE PLASTIC HAS NO SCRATCHES ON IT.

Step 3: Sticking Everthing Together

View the paper model to see how everything sticks together:

The 45 degrees angled lines on the lighter gray shapes show where the CD cases rectangles go.
Hold the rectangles next to the 45 degrees lines untill you find the line with the same length and glue onto the line, make sure it is vertically upright.

once you have done that for all the peices place the second side on top and glue on.

This paper model showes how the front section should come together.