3D Rainbow Shadows




Introduction: 3D Rainbow Shadows

About: ! Error 404 !

This is a fun and very simple Instructable to understand the nature of different colored lights aka wavelengths and also their effect as a shadow when casted on a screen !!!!!

This is to experiment with the old school 3D film technique !!!

Let's get started !!!!


  • RGB(Red Green Blue)LED's Amazon
  • 9V Battery and connecting clips Amazon
  • Some Objects!!!
  • Screen (probably your wall)

Step 1: Preparing Your GIZMOS

I have used 1 watt LED of RGB color , that I have recovered from an old disco lamps , that also came with a simple heat sink.

If you don't have one , Grab 3* Red,Green and blue led(1W) and arrange them in a triangular shape (like an equilateral triangle).Connect as shown in circuit diagram.

That's it your small old school rainbow caster is done!!!

Step 2: Have Fun Casting Your Rainbows !!

Choose a wall to cast upon and power up your LED with 9 volt battery and connector .

You will immediately notice the color chart type shadows on the wall and the surprising thing happens when you cast the LED on any objects where you will see the old school 3D shadows on the screen/wall.

Have a 3D glass watch your shadows and be surprised and amazed !!!

How it works ??

3D glasses with blue and red filters ensured viewers’ left and right eyes saw the correct image: the red filter would only let red light through to your left eye, and the blue filter would only let blue light through to your right eye. Your brain would then combine these two slightly different images to create the illusion of 3D.

In old fashioned 3D films, footage for the left eye would be filmed using a red lens filter, producing a red image, and footage for the right eye would be shot using a blue filter, resulting in a blue image. Two projectors then superimposed the images on the cinema screen.

If you look at an object near you and close your left and right eyes in turn, you’ll see that each has a slightly different view of the world. Your left eye sees a bit more of the left side of the object, and your right eye sees a bit more of its right side. Your brain fuses the two images together allowing you to see in three dimensions. This is known as stereoscopic vision.

Thank You and Happy Tinkering !!!

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    3 years ago

    That looks so neat!


    Reply 3 years ago

    And thanks for the instructables guide !!


    Reply 3 years ago

    Thank you mam :)