This program demonstrates how context influences our perception of colors. Adjust the "inner color" sliders until the two interior colors appear to match. You can then compare the actual hues by selecting the "show match" button. Often, colors which appear the same are in fact quite different. I have selected some presets which demonstrate this more or less dramatically (at least to my eye on my particular monitor). If you find any compelling combinations please contact me and I will add them to the presets.