Focus, it is all about the Focus!

Have you ever asked yourself how,
scary, hm not...this scary Foto that appeared today on the blog of, works?

Ok, like we already know the biggest mysterys often have the easyest ways to solve them, so what is needed here to understand how this effect comes to your eyes?

Some basic knowledge about eyes, and a artikel, this is all to solve this puzzel.

According to “Roger N. Clark” the Human eye has an equivalent Resolution of 576 megapixels (24,000 x 24,000), on a 120° field of view. The human Eye has Only a small spot sharp Spot in the middel of the retina (Fovea Centralis), this small spot is what lets our brain understand that what we are looking upon is sharp, because we “focus” it, you can try this for yourself by trying to read in the newspaper and have the finger directly under the line you try to read, then you keep your focus on the finger and it will be hard for you to read what is written only centimeters above your fingertip.

So now we know that the “Sharp Spot” of your eye is not that big, to be more exact it is about 1 megapixel, so what happens in this picture?

You see a picture that is divided into two parts, with a clear black line in the middel, the images displayed to the right and to the left are shart while the other is not and has some horrible mimics. So how does the face on the left side come to the face of the right side if only you are leaving for about 8 steps away? The high resolution of your computer Monitor (and probably the one on the picture too), make it impossible for the human eye to see theese mimics that in the basic are only some very thin lines, but the face it self becomes unfocused, the thick black line around the head becomes thinner and thinner because the pixels shown become mor smaller, and the your brain starts to mix them, there is simply no chance for it to render it more clearly in it thinks anyway makes no sense currently. This effect happens to the rest of the left picture too, and so it becomes the same as the right one, while when you where sitting directly infront of your screen.

If you look more closely the right picture changes too and it is getting more and more unfocused, so in the end the left picture wont get any sharper or something, your brain only thinks “nah, i dont need all this information right now, there are more important things to see”, your brain trys to remember if it has seen this face before, and it did, exactly 8 steps before, this is why you think the right picture looks still the same.

The Picture and the whole story where found on


2 Responses to “Focus, it is all about the Focus!”

  1. […] close up and from a distance, and the resolutions at both of these points. Decoye Gheist has a plausible explanation. The image itself is made by superimposing the pictures after going through low pass filter and a […]

  2. […] Filed under: Uncategorized — Decoye Gheist @ 2:28 pm Yesterday, i was writing an Artikel (Focus it is all about the Focus) about how the effect of those “Hybrid Pictures” work, i came across of even more of […]

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