- After this, I investigated what is essential for a proposition to be true and certain. Since I had found one proposition that I knew was true, I believed I should be able to find the basis for this certainty as well.
- Is My Blue Your Blue? (ismy.blue)
People have different names for the colors they see. Language can affect how we memorize and name colors. This is a color naming test designed to measure your personal blue-green boundary.