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FLASHING DOTS ILLUSION

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Author: Xray

Group: Default

Filesize: 37.27 kB

Date added: 2013-02-13

Rating: 5.9

Downloads: 627

Comments: 11

Ratings: 3

Times favored: 0

Made with: Algodoo v2.0.2 Edu

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Two large dots are slowly flashing black and white. Are they flashing together in synch, or are they alternately flashing out of synch with each other? CONTEXT IS EVERYTHING when it comes to seeing what you think you see!

Edit - Just letting you know that I do not do anything funny with Thyme script or anything else when the black/white squares are moved away from the dots. The two dots are always flashing together in synch. In other words, they are black at the same time and white at the same time. But when you move the black/white squares behind the dots, they are now situated in a different "context", and it's the context that makes your brain think that they are flashing alternately. If you are not convinced of this, then cut two holes in a thick sheet of paper or cardboard the size of the two dots and separated by the same distance on your monitor. While the dots appear to be alternately flashing, hold the paper or cardboard up to your monitor so that the dots can be seen through the holes, and the black/white squares can no longer be seen.

Last edited at 2013/02/13 06:42:07 by Xray

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Responses to this scene

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previous | 1 | next

Xray

2013/02/13 06:47:20

If the thumbnail picture shows black and yellow squares instead of black and white, it's because the first time I uploaded this scene, the right square was yellow. But I realized that I can get a much stronger effect by making the right square white, and so I changed it. After editing and uploading the scene, I noticed that the thumbnail from the original scene was still being displayed on Algobox. )|(

faytree

2013/02/13 10:35:51

Nah,now it shows yellow squares no more.Please wait for a moment i will edit my comment

s_noonan

2013/02/13 10:53:58

The dots appeared to be flashing alternately, so I "fixed" it by using color = { [1.0 - scene.my.v, 1.0 - scene.my.v, 1.0 - scene.my.v, 1.0]} for one of the dots (I'm joking).

I also used scene.my.v = (math.sin(_m * 2) + 1.0) / 2.0 for a full sine wave instead of a fully rectified sine wave.

Last edited at 2013/02/13 10:56:26 by s_noonan

Phun User

2013/02/13 13:55:31

Mind boggling.

Xray

2013/02/13 16:34:20

faytree - Yes, I see that the thumbnail is now correct. It must take a while for the thumbnail to update after editing a scene.

s_noonan - Both of our equations give the absolute value of the sine function, but yours is more efficient because it doesn't use exponential functions. I didn't think to use the "+ 1.0" for getting rid of negative values, but I will in the future! Thanks!

s_noonan

2013/02/13 23:12:02

Xray - They are 2 different waveforms. To see a plot, hinge a circle to the background, set the circle angVel = {scene.my.v}, then plot angVel vs. time. Either way, they both work fine. I'm just being picky.

Xray

2013/02/19 17:05:47

I tried your experiment, and now I see your point. Thanks!

bugsbunny

2013/07/15 12:54:05

ITS SCRIPTED I SAW IN DA SCRIPTT MENU OF DA TWO DOTS THERE SCRIPTED.

bugsbunny

2013/07/15 12:54:59

Oh I get it now ha ha. Doesn't do anything.

AwesomeChristos8

2015/08/17 05:45:17

The Dots Are The Sime Size.

AwesomeChristos8

2015/08/17 05:45:31

I Mean Color.