Red and blue. Two colours on opposite sides. Red invokes passion, blue serenity. Ironically, it is blue that is the more energetic.
Betelgeuse. Temperature: 3140 – 3641 K
Sirius A (and white dwarf Sirius B). Temperature: 9940 K
Green. The colour that exists between blue and red. A colour that seems just natural. Not only the colour of plant life, but it is the colour the human eye can most easily distinguish at night.
Panellus Stipticus, bioluminescent fungi
Yellow. The light combination of red and green. A colour that is…precious. From the Sun to gold, what other colour has been more attractive to civilization?
King Tuthankhamun’s burial mask. Photo taken by Bjørn Christian Tørrissen and licensed under CC-BY-SA
Brown. A colour often thought of as dull, even repulsive. And yet, it has its own grounded beauty in the right places. It’s the colour of human skin, after all.
Methuselah Grove, featuring a bristlecone pine more than 4800 years old. Photo by Oke and licensed under CC-BY-SA
White, the union of all light colours. To some, it is the colour of purity. To others, the colour of death. At times, it can be both.
Snow. From publicdomainimages.net by Peter Griffin
Black, the absence of light. Often symbolic of all that is ill, but itself it is merely a void. Just as numbers need a zero, colours need a lack thereof.
And there are my personal favourites depending on mood. For cheerful times, cyan, the light combination of blue and green, radiating the best qualities of the two. For more melancholy times, purple, the rarest of colours in nature. A mysterious colour, perfect for, say, a strange little town in WordPress.