Quoting Stella #3

Stella has created a whole new color scheme for our family.  The colors in this group are the "day time" and "night time" colors.  Any time we ask Stella about a color that she has to imagine, for example, what color she wants her new room to be, she tells us "Uuuummm day time blue."

At first she was just saying day time and night time about blue, so I thought she was talking about sky blue.  Now we have realized that she has correlated darkness (as in night time) and light (as in day time) to colors.  What a smart little bean!