Pontiuth Pilate
Republican Jesus!
I don't get the very first one posted in this thread? 
Optical Illusions
- Thread starter gozpel
- Start date
Akka
Moody old mage.
Wow! Congrats, I'm not often wrong but when I am I admit defeat. 
Gengis Khan
Deity
Simply amazing!!
Norlamand
Procrastinator Rex
good stuff.......now I have a headache......
Darth_Pugwash
wobble wobble
- Joined
- Apr 6, 2003
- Messages
- 2,873
These things are amazing!
Gengis Khan
Deity
I don't see whats an illusion about the 2nd one??
Akka
Moody old mage.
Well, I suppose the illusion is that we have the impression that there is a coloured figure while in fact it's only black and white
Gengis Khan
Deity
Looks black & white to me, maybe if he said all the lines were the same width or something.
An explanation for the blue and yellow squares:
Obviously we do not realise the things the brain does on our behalf until they are made clear. When we look at colours, we see them in a wide variety of conditions. At dusk, at dawn, the different wavelengths of light reflect off objects in many different ways. The intensity of sunlight, the angle of reflection, loads of other things, all play a part.
But if we look at a green object, say, we generally see it always the same colour. We think this is normal. In fact, the brain has normalised the colour (which is always fluctuating in some way) so that we are not put off by constantly different seeming colours.
In the blue and yellow squares picture, the brain has normalised the colour for you depending on it's context. So it has been 'normalised' to the extent that it looks completely different according to the background.
Weird eh?
Obviously we do not realise the things the brain does on our behalf until they are made clear. When we look at colours, we see them in a wide variety of conditions. At dusk, at dawn, the different wavelengths of light reflect off objects in many different ways. The intensity of sunlight, the angle of reflection, loads of other things, all play a part.
But if we look at a green object, say, we generally see it always the same colour. We think this is normal. In fact, the brain has normalised the colour (which is always fluctuating in some way) so that we are not put off by constantly different seeming colours.
In the blue and yellow squares picture, the brain has normalised the colour for you depending on it's context. So it has been 'normalised' to the extent that it looks completely different according to the background.
Weird eh?
That last one with the 'x' in the picture works because of the way the brain adjusts the intensity of dark and light colours when they are next to each other. Again, it's a kind of normalisation process.
Same kind of principle as the one with the circles coming out from the centre of the picture.
Same kind of principle as the one with the circles coming out from the centre of the picture.
