Hey guys,

I like optical illusions and paradoxes, and I though of making maybe one of two paradoxical objects in 3D (or at least an illusion of the objects)

I've uploaded the Penrose Staircase on shapeways. I'm not sure I'll be prototyping it, knowing that I bought three of my puzzles yesterday and today, so I'm short in cash, but I don't think it really needs prototyping of course.

You can see the 3D simulation in this link.

Here is the result, when you watch it from a certain point of view (picture)

Enjoy!

- Greg

Now this is some good stuff! You really need to know and understand the way
it looks in higher than three dimensions, and then realise how it will become
an illusion in two dimensions. And then, you print it as a three dimensional object!

Excellent!




Pantazis

Thanks a lot!!

- Greg

Very cool! The only possible problem I see is that most 3d design programs don't take parallax into account while in "design mode" this means that two parallel line will never touch, when in reality they appear to merge into a vanising point. Because this object relies on a certain viewing angle to create the illusion, I would check to make sure everything is perfect before you go out and order one. If this works out well, I may order one, because its pretty cool! Now go make some Other impossible objects like the impossible triangle and Escher's house!

Here's the Penrose Triangle!

I like Penrose

This one is a bit bigger and therefore costs more: 13.3cmx10cmx10cm = 22.42$

- Greg

EDIT: What were you saying Eric? xD

EDIT 2: My Design software actually does work with Perspective, so the illusion is true

This is my version of the Window Paradox!

Enjoy!

- Greg

You should look into the guy who figured out how to actually make some of these (especially the penrose triangle) a much different way. I can't remember the video or link, but google something about "impossible geometries solved" or something like that.

They wrote a program that takes drawings and turns them into 3d models (pretty neat, right?) and then fed it impossible geometries to test it, and were surprised when it came up with solutions for some of them.

I'll look for it now.

You mean the guy who made this?

From a certain angle it looks like the penrose triangle

I'm not sure but I believe it's Escher

- Greg

No, it's made by NOT using 90 degree angles.

This version?

If I'm still mistaken can you find what you're trying to explain because I dont exactly understand, but here there is no 90 degreee turn!

- Greg

P.S: I got the stl files for both versions

Sounds like theVDude may be thinking of the work of the Japanese mathematician Kokichi Sugihara on illusions of non-rectangularity which I linked to in this post.

Here is a link to a video describing his work on creating "impossible" 3D solids:
http://gcoe.mims.meiji.ac.jp/jpn/movie/impossible/index.html

Wow thanks a lot!!!

Lol I made all two versions of the triangle that are shown on the video

But now there are more optical illusions I cam make! thanks!!

- Greg

Thanks, I thought I was going crazy for a minute.

good thread

try this puzzle set...

Our friend Leonid has done that and more!

http://www.puzzlemochalovlp.com/




Pantazis

Nice!!!

Did any of you see that rubik's illusion poster before?

- Greg

ok, we will need to create two new topics to accommodate all the above:

1. Optical Illusions.
2. Impossible Objects.

Of course, sometimes those two topics can be considering the same subject at the same time!!!




Pantazis

Well tehnically, I make 3D illusions of mpossible solids, so is it one or two topics?

If anyone has other cool impossible figures that they kow about, can you please share them?

Thanks!

- Greg

You could change the topic of your post to "Impossible Objects and Optical Illusions".

Here is my contribution so far (which demonstrates my home's hydraulic system):






Pantazis

Done!

I like your way to make water flow constantly although If I model it it won't be considered an impossible oject (or did I miss something?)

I think I might upload more Penrose triangles (but this time full triangles)

- Greg

Of course, that's not supposed to be one solid piece, it's 4 elbow joints for pipes.

I was always a fan of this stuff:
http://www.impossibottle.co.uk/bob.html

How did he do that? xD

This is hard to understand, wow!

- Greg

This site also has some pretty interesting stuff, and a few of them with real-life objects

Oh man, I really want to know how a deck of cards with the cellophane still on went into a jar... or how a 1 piece arrow can go through a nut, if I could figure that out, I could probably do anything.

For a little while, I was involved in the making of several impossible bottles. They included tennis balls, packs of crayons and cards, pieces of wood/card decks with screws planted firmly in them, pairs of scissors, and knots. I tried a Rubik's Cube but found it a bit tricky to do in a wine bottle. Photos of some of my examples can be found here.

I think I know how it's done. Here's a video of something similar.

Spoiler Alert: http://www.youtube.com/watch?v=fEATei2wewY