Upside-down Glasses




About: I'm M@. If you know Prototype This, TechShop, The Best of Instructables, Show Me How, or AVPII: Requiem, you've seen some of my work and the cool stuff I've been involved in. I build and design and make and ...
Here's a quick simple pattern for making glasses that turn your vision upside down. Although this could be cut by hand, it'd be nearly impossible. All of this was designed for the Instructables laser cutter. The only things you need for materials are 4-40 machine screws, standard washers, and 4-40 nuts, four of each. You'll also need a piece of mirrored plexiglass.

Step 1: Download and Laserize

If you just want to get yourself a pair of perspective flipping goggles, all you have to do is download the file, arrange the parts to be cut (being sure to include two earpieces, they're identical, you know) and laser cut yourself a pair (mirror side down on the plastic, please.) It's pretty simple.

What those of you without laser cutters (poor souls that you are) may take away is this cool construction method I learned from puzzle maker Lee Krasnow. I measured my screws, nuts, and washers, and modeled them simply in cad. I measured the width of my plexiglass. Knowing those dimensions, I could make some tabs in the design. When the design is put together, the tabs keep the different panels aligned and square to one another. the screws fit down through the holes, and connect with the nuts in the adjacent panel. The nuts are held fixed by their tight fitting in the plastic. Putting these together is a breeze, really.

Step 2: See?

These are just a fancy version of holding a mirror underneath your eyes and looking down into it. The effect is pretty cool, but the design could use a little more tweaking to be perfect.

I went through a lot of revisions in the design, testing and prototyping the model before reaching a final product. The laser cutter made it easy to test new revisions on the spot.

Step 3: Cool.

Nes pas?



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    28 Discussions


    Reply 2 years ago


    that text you made was incorrect.

    This does not rotate 180° on the Z axis. Instead, it would invert

    your Y scale from 1 to -1.

    This being said, you would have to have the text in correct order, but upside down.

    (For example: '¡ןooɔ' would be 'cool¡')


    5 years ago on Introduction

    Nice job but a lot of extra light into your eyes and very

    small field of view.

    Among scientists this device is named invertoscope.


    7 years ago on Introduction

    Woah, the glassses are, like, upside down or something! ;) (JK LOL)


    ok i made and have been wearing for three days (much to my teachers delight) and my vision has not flipped over. you are a LIAR! LOL


    Reply 10 years ago on Introduction

    ya, if you were them constantly, like never take them off, for long enough your mind will flip the image in your head and you'll see normal. then when you take them off, everything will be upside down until your brain resets it. they did this as a psych experiment once. i wish i had a laser cutter to make a pair and try it myself


    Haha! Cool! Awesome attempt, Eric! You were so close! I'm just curious - where does one go to get acrylic sheets/ mirrored acrylic sheets? (Other than the Instructables Supply Shelf....)

    1 reply

    Reply 11 years ago on Introduction it's called reflective acrylic or mirror-backed acrylic. Something like that.


    11 years ago on Introduction

    i think someone with a steady hand could cut these out with a small saw. You don't need all the tabs and grooves; they could just glue them together with the right angles. You might also try uploading the design to Ponoko; then people can just order them directly, from there...

    1 reply

    Reply 11 years ago on Introduction

    I cannot open the pdf file with instructions. I see you did it. Can you email me the instructions as attachement? Thanks in advance. Bub