Have you ever seen red? Or felt blue? Has someone ever accused you of being yellow? Perhaps your best friend got a new bike and you were green with envy? What's up with all of these colors associated with emotions? Let's find out more today in Wonderopolis!

Artists have known for centuries that colors can affect human emotions. The first artists may have simply tried to recreate the colors in the scenes in front of them, but it wasn't long before artists were creating works that sprang entirely from their imaginations. For hundreds of years, artists have used unique colors to make their works pleasing to both the eye and the heart.

Perhaps you've noticed that certain colors seem to speak to you. For example, does red capture your attention? The makers of stop signs sure hope it does!

Or what about yellow? Do certain shades of yellow make you take notice? The people who created school bus yellow believe that particular shade makes school buses more noticeable and therefore safer.

In modern times, psychologists and physiologists have studied colors and their effects on human emotions. Numerous studies have shown correlations between colors and our emotions.

For example, can you guess what color evokes the most positive emotions, such as peace, hope and happiness? It's green! Why? Scientists aren't sure, but some believe it could have something to do with how often the color green is found in nature.

What emotions do other colors tend to be associated with? Yellow tends to elicit happiness and excitement. Could it be because the color yellow makes us think of the sun and summer? Maybe!

Although we sometimes say we feel blue, meaning we feel down in the dumps, the color blue is also often associated with feelings such as soothing calm and relaxation. Perhaps this is due to a correlation with the color blue and the ocean or the sky.

Negative feelings accompanied colors like black and gray. Black, for example, brought about feelings of fear, anger and depression. Scientists guess that this could be due to the color black's connection to mourning and tragedy.

Likewise, gray led to feelings of sadness and boredom. Any guesses as to why? Researchers believe it could be because the color gray is associated with clouds and bad weather.

Other colors might evoke a mixture of emotions, depending upon each individual. Take red, for example. For some, the color red is associated with love and romance. For others, though, it might bring about thoughts of blood and anger.

One thing scientists can agree upon is that reaction to colors is a highly personal experience. Your experience will likely be different from anyone else's, because your reactions will depend upon your personal preferences and your past experiences with colors.

For example, if your favorite color is black and your favorite sports teams all wear black, then you probably would have a highly positive reaction to black. In the same way, you might have a negative reaction to green, if you personally don't like green and have had bad experiences with green things in the past.

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Tomorrow’s Wonder of the Day takes an up-close look at some fascinating, mix-and-match animals!