What is the all blue?

The term "all blue" is often used to describe a situation, event, or object that is completely blue in color. For example, an "all blue outfit" would consist of clothing items that are all blue.

In nature, "all blue" can refer to certain flowers, animals, or natural phenomena that are primarily blue in color. For example, the all-blue morpho butterfly is a species of butterfly known for its striking blue coloration.

In terms of popular culture, the phrase "all blue" has been used in various contexts, such as in music lyrics or as the title of songs. Additionally, "all blue" can also refer to the feeling of being sad or melancholy, as blue is often associated with emotions such as sadness or sorrow.

Overall, "all blue" is a versatile phrase that can be used to describe a wide range of things that are predominantly blue in color or emotion.