Have you ever thought you saw someone in the corner of your eye, and when you looked there was no person there? ... We know things are there because: Light hits the retina of the eye And this changes the chemical composition of the eye Right? ... For example, a rose might look red to us, but if no one was looking at it, we couldn't really say it was red. We might have said it had the power to elicit the colour red in our minds, but this primary quality of being able to elicit the red colour is simply the manifestation of sensory visualization correlating itself with our perception...

• Word Count: 2636
• Approx Pages: 11
• Grade Level: High School

Note that the paper appears to be white regardless of the actual amount of light energy that enters the eye. ... In spite of the fact that the colored lenses change the color of light reaching your retina, you still perceive white objects as white and red objects as red. ...

• Word Count: 4405
• Approx Pages: 18
• Has Bibliography

For example, the tabletop, although it appears to be perfectly square and flat to the naked eye, might on closer examination prove not to be so: the corners might not be at exact right angles, and it might be discovered that, when viewed through a microscope, the table surface is in fact quite bumpy and not exactly flat. ... This is similar to the fact that we cannot imagine any colour outside of the colour spectrum; although we can mix up colours to make a colour that we have never seen before, it would still be a colour essentially composed of a mixture of red, blue or yellow. ...

• Word Count: 2633
• Approx Pages: 11
• Grade Level: Undergraduate