Evolution of human colour vision similar. Tritanopes are missing the short wavelength sensitive opsins and see short wavelength colours in a green hue and dim compared to other colours. They may also see some short wavelength colours as black. Other perception problems include distinguishing yellow from pink or purple colours being perceived as shades of red. Researchers have found that trichromacy has advantages over dichromacy or anomalous trichromacy at further distances. This is believed to occur because visual cues such as shape decrease for colour vision as distance increases for targets of a smaller size. Using tests for spotting fruit pieces in bushes at distances
The Colour Out of Space of his stylistically and conceptually finest short stories." Joshi praises the work as one of Lovecraft's best and most frightening, particularly for the vagueness of the description of the story's eponymous horror. He also lauded the work as Lovecraft's most successful attempt to create something entirely outside of the human experience, as the creature's motive (if any) is unknown and it is impossible to discern whether or not the "colour" is emotional, moral, or even conscious. His only criticism is that it is "just a little too long". The text of "The Colour Out of Space", like many of Lovecraft's