Machsupport Forum

Tangent Corner => Tangent Corner => Topic started by: Tweakie.CNC on November 03, 2017, 02:44:19 AM

Title: Optical Illusion.
Post by: Tweakie.CNC on November 03, 2017, 02:44:19 AM

There are countless optical illusions but I think this is one of the best.

The squares A and B are exactly the same shade of grey.

(I did actually have to copy and paste the image into Paint and use the colour picker in order to draw a line through the two squares just to prove it to myself)

Tweakie.

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on November 03, 2017, 08:16:13 AM

This video demonstrate the principle;  https://youtu.be/z9Sen1HTu5o (https://youtu.be/z9Sen1HTu5o)

Tweakie.

Title: Re: Optical Illusion.
Post by: Chaoticone on November 03, 2017, 05:09:58 PM

 ???   :o   8)

Good one Tweakie! That's right up there with the beer goggles effect.

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on November 04, 2017, 04:27:16 AM

Ahhh, the Beer Goggles   ;D

Tweakie.

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on November 15, 2017, 06:35:44 AM

Interesting that the illusion can be reproduced by laser etching.

Tweakie.

Title: Re: Optical Illusion.
Post by: Chaoticone on November 15, 2017, 10:59:51 PM

Nice Tweakie!

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on November 24, 2017, 04:41:11 AM

By way of proof, a good friend of mine in Hungary sent me this picture. He has copied a section of the A square and pasted it by the B square and done a similar thing with the B and A squares to prove that my laser etched shades of the two squares are indeed the same.

Tweakie.

Title: Re: Optical Illusion.
Post by: Chaoticone on November 24, 2017, 06:19:02 AM

That's great Tweakie! What did you use to generate the Gcode for the laser? Did he actually do the laser etching too?  If so, is he running your Gcode or generating his own?

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on November 24, 2017, 06:53:46 AM

My Hungarian friend just copied my posted picture and then used Photoshop (or similar) to do the copy and paste. He did say that he could not believe his eyes so all credit must go to E.H.Adelson for creating such an excellent and reproducible optical illusion.

(I have to admit to being a bit dis-loyal but the Gcode was generated and the image laser produced using the Auggie / 57CNC Tempest planner and motion controller).
 
Tweakie.

Title: Re: Optical Illusion.
Post by: Overloaded on January 05, 2018, 07:18:30 PM

Very nice Tweakie, that is a good one.
I tore two small holes in a piece of paper and laid it over the screen .... dead nuts, identical.
Really cool !
(too blurred to recognize through my beer goggles)
Thanks,
Russ

Title: Re: Optical Illusion.
Post by: David Jatt on July 17, 2018, 12:13:41 PM

These things always mess with my head!

Title: Re: Optical Illusion.
Post by: Tweakie.CNC on April 17, 2023, 04:01:20 AM

Another illustration on the same theme where the squares marked X are exactly the same shade of grey.

Tweakie.

Title: Re: Optical Illusion.
Post by: Overloaded on May 30, 2023, 04:19:58 PM

Still amazes me every time I pass it on.

Thanks again, Tweakie,
Russ