Lusser's Law is a rule that helps people to understand how they see colors. Imagine you have a big box of colors with crayons, markers and pencils, and you want to create a picture. When you look at the colors, you notice that some of them are brighter than others. This is because some colors have more light in them than others.
Lusser's Law says that the brighter a color is, the less it can be mixed with other colors. This means that if you have a really bright yellow color, you can't mix it with a lot of red or blue to make different shades of orange or green. The yellow will always be really bright, and it won't blend well with other colors.
On the other hand, if you have a darker color, like a dark blue, you can mix it with other colors to create different shades of green or purple. This is because the darker color has less light in it, so it can be mixed with other colors without being too bright.
So, Lusser's Law is like a rule that helps us to understand how colors work together. It tells us that some colors are really bright and don't mix well with others, while darker colors are easier to mix with other colors to create new shades.