This workshop looks especially nice for me and I hope you enjoy it as much as I did.

A few weeks ago I discovered a video in a blog that I like (Bricogeek) showing a piece of plastic shaped like an inverted pyramid placed on the screen of a smartphone. The phone projected 3D images inside the pyramid. I had some basic knowledge on the functioning of the holographic images but I never thought it was so easy to make a rudimentary version with materials we all have at home. So I start to work and the result was pretty good. In a fes minutes I was projecting holograms on my Galaxy Note 4.

If you also want to make your own holographic system to impress friends and family, and especially the younger member of the house, this is your chance  🙂


An important point is that for the pyramid manufacture can be used any transparent material. The easiest option is to use a flexible transparent plastic like a sheet of acetate that is easy to cut with scissors. The “professional” and lasting option is to use a stiffer plastic like a methacrylate sheet or a transparent plastic CD cover.

I built a pyramid of each material and I have placed a tutorial for each assemblies.

Here I put the full list of required material:

  • Cardboard
  • Methacrylate sheet / transparent CD cover or transparent acetate sheet
  • Ruler and compass
  • Cutter
  • Roll of tape
  • Instant glue
  • Pen and permanent maker


If you have decided to build your pyramid with rigid plastic you’ll get a better and more durable result but the process will be a bit more complex. You’ll have to cut a cardboard template, paint it in the final material and get 4 equal pieces that will be the pyramid sides, and finally you’ll have to paste all of them.

  1. The first thing to do is to make the template with the pyramid faces on the cardboard. For that we draw a circle with the compass, with approximate radius of the measure of the smartphone or tablet screen width. In my case de measure used is 7cm.
  2. With the same previous measurement (without changing the compass opening) we will mark intervals along the circle perimeter.
  3. With ruler and pencil we draw lines to join the marks we just did, forming a perfect hexagon.
  4. We connect each end of the hexagon with the center of the circle to obtain six equilateral triangles.
  5. We need to make another circle in the center of the big one about 5mm radi (1cm diameter), and we need to join the intersections of this small circle with the lines we have drawn before, so it is another small hexagon inside the big one. This is done to have a pyramid without endingo on peak but a 1cm square base side on the top. And so the pyramid will remain on the phone screen uspide sown without falling.
  6. We cut one of the resulting triangles, which will be the template to draw the final triangles on the methacrylate sheet or CD cover.
  7. Now we have the template. We have to replicate the triangle four times in the transparent material. We will use a permanent maker.
  8. We cut the pieces. The simplest way is strongly mark the lines with a cutter (helping with the ruler to have completely straight cuts) and carefully fold the plastic until it split along the scored line.
  9. All right! We have all the pieces of the pyramid! Now we just stick them. This is the most delicate step. I used instant glue and I was putting it on each edge, using tape to keep both pieces together while drying.


If we decide to use a flexible plastic we will have to draw directly the sides of the pyramid on the plastic sheet and join the ends with tape.

1 – 5. The process of drawing the pyramid sides is the same as the steps 1-5 of the previous method but in this case we will draw directly on the plastic sheet using the compass and a permanent maker to draw the lines forming the hexagons and interior triangles.

6. We cut the perimeter of the hexagon with scissors and we remove 2 of the sides, so that there is four triangles together. We also need to cut the internal hexagon to finish the pyramid on a square base of side 1cm.

7. We mark the sides of the triangles with the scissors to make it easier to bend right down the line. Doing it the sides of the pyramid are perfectly straight.

8. We bend the plastic to form the pyramid.

9. We put together the edges of the pyramid with cellophane tape. And that’s it! We have our plastic pyramid ready to project!

And with that we have completed our pyramid in either of two ways. Now we need to enjoy fantastic videos with our sophisticated holographic system. You can find plenty of videos ready for viewing with this system on Youtube. At the end of the post I put several example videos.


Here you can see the end result. As you can see, it is quite impressive and curious 🙂


There are many videos prepared to be viewed with the pyramid just built on Youtube. If you search “Holographic technology” or “Holographic pyramid” you can enjoy many examples. I put two videos so that you begin to enjoy. The first one is a compilation of several different animations and the second one is a funny video of a Minion.



This is all. I hope you enjoy it and see you at the next workshop of El Jardín Digital.







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