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What things are known to be blue?

What things are known to be blue?

Blue is one of the three primary colors, along with red and yellow. It occupies the part of the visible color spectrum between green and violet. Blue is a very common color in nature, including in the sky, bodies of water, and various plants and animals.

The Sky

One of the most universally recognized blue objects is the sky. On a clear day, the sky appears as a light to medium blue. This is due to the way air molecules scatter sunlight. Shorter wavelengths, such as blue light, are scattered more easily compared to longer wavelengths like red. This causes the sky to take on a blue hue during the day.


Bodies of water also commonly appear blue. This is because water absorbs long wavelength colors like red and reflects shorter blues and greens. The ocean ranging from light to deep blue depending on factors like depth and composition. Lakes, rivers, and pools also frequently exhibit blue coloration.

Blue Foods

While not as common as blue skies and seas, some foods found in nature display blue pigmentation:

Food Shade of Blue
Blueberries Indigo
Blue radishes Vivid blue
Blue potatoes Light blue
Blue carrots Powder blue

The blue hues come from anthocyanins, which are pigments with antioxidant properties. While vegetables like carrots are usually orange, mutations can cause them to accumulate blue anthocyanins instead.

Blue Animals

Some animals exhibit brilliant blue coloration. This is often for purposes like attracting mates, camouflage, or warning off predators. Here are some examples of blue creatures:

  • Blue tang fish – Bright neon blue with darker blue stripes
  • Blue bird-of-paradise – Steel blue feathers accented with emerald green
  • Blue dragon sea slug – Cobalt blue body with blue and yellow cerata
  • Blue jay – Pale to deep blue feathers with white and black accents
  • Blue poison dart frog – Vibrant light blue skin with dark blue legs

The blue pigmentation comes from structural color instead of blue pigments. It’s caused by how the feathers or skin reflect light. This blue structural coloration is very vibrant and can appear iridescent.

Human-Made Blue Things

While blue occurs frequently in nature, humans have also engineered many objects to be blue for aesthetic or practical purposes:

Object Typical Shade
Blue jeans Indigo denim
Blue pens Royal, navy, sky blue
Crayola crayons Cerulean, blue-green, navy blue
Blue M&Ms Bright blue candy coating

Blue is commonly used in apparel like jeans to provide a classic, versatile look. It’s also popular for writing instruments, candy, and other commercial items.

Blue in Culture

Blue holds deep symbolic meaning in cultures around the world:

  • Calmness – Light blue evokes tranquility, relaxation, and peace
  • Depression – Feeling “blue” refers to sadness or melancholy
  • Masculinity – Navy blue is a masculine color associated with suits and ties
  • Royalty – Royal blue conveys luxury due to dye’s former expense
  • Spirituality – Blue has spiritual significance in religions like Judaism

Light blue especially conjures images of serenity, making it popular for spas and self-care products. Darker shades can feel professional and confident.

Blue in Visual Arts

Blue has inspired artists for centuries and remains a favorite color in painting and design:

  • Rococo – Playful pastel blues in Watteau’s Pilgrimage to Cythera
  • Impressionism – Renoir’s Swing shows dappled blue water
  • Expressionism – The Old Guitarist by Picasso features cool, melancholy blues
  • Minimalism – Anish Kapoor’s sculptures utilize vibrant blues

From the moody blue works of Picasso to the calming monochromatic blues of Yves Klein, blue inspires creativity across artistic movements.

Favorite Blue Shades

With blue representing everything from the sky to blueberries, there are endless shades to enjoy. Here are some of the most popular blue tones:

Blue Shade Hex Code
Azure #007FFF
Baby Blue #89CFF0
Navy #000080
Royal Blue #4169E1
Sky Blue #87CEEB

Tranquil sky blue and playful baby blue are youthful favorites. Rich navy and royal blues convey sophistication. Azure brings to mind beautiful blue skies.

Blue in Business

Blue promotes productivity and trust in business environments. Studies show it can:

  • Increase productivity and focus
  • Convey dependability and security
  • Promote calmness and logical thinking
  • Reduce stress and lower blood pressure

Popular technology companies like Facebook, Twitter, Intel, Dell, and Samsung all incorporate blue in their branding and products.


Blue is a prevalent and meaningful color found everywhere from the natural world to human culture. Light blue tones evoke tranquility, while darker blues convey confidence, intelligence, and stability. From inspiring artists to selling products, blue is a versatile, stimulating shade.