Gloom is a low level of light which is so dim that there are physiological and psychological effects. Human vision at this level becomes

monochrome A monochrome or monochromatic image, object or palette is composed of one color (or values of one color). Images using only shades of grey are called grayscale (typically digital) or black-and-white (typically analog). In physics, mon ...

and has lessened clarity.

Optical and psychological effects

Light conditions may be considered gloomy when the level of light in an environment is too low for the proper function of

cone cell Cone cells or cones are photoreceptor cells in the retina of the vertebrate eye. Cones are active in daylight conditions and enable photopic vision, as opposed to rod cells, which are active in dim light and enable scotopic vision. Most v ...

s, and

colour vision Color vision, a feature of visual perception, is an ability to perceive differences between light composed of different frequencies independently of light intensity. Color perception is a part of the larger visual system and is mediated by a co ...

is lost. In a study by Rothwell and Campbell, light levels described as "gloomy" fell between 28 and 3.6 cd/m². Low light and lack of color of this sort may be associated with depression and

lethargy Lethargy is a state of tiredness, sleepiness, weariness, fatigue, sluggishness, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy. Lethargy can be a normal response to inadequate sleep, overexertion, overw ...

. This association was made as far back as the 2nd century by the ancient Greek physician, Aretaeus of Cappadocia, who said, "Lethargics are to be laid in the light and exposed to the rays of the sun, for the disease is gloom." Also, some studies have found weaker electrical activity in the

retina The retina (; or retinas) is the innermost, photosensitivity, light-sensitive layer of tissue (biology), tissue of the eye of most vertebrates and some Mollusca, molluscs. The optics of the eye create a focus (optics), focused two-dimensional ...

s of depressed people, which gave the individuals studied poor visual contrast, meaning that they saw the world in grayer hues. The naturally weak

daylight Daylight is the combination of all direct and indirect sunlight during the daytime. This includes direct sunlight, diffuse sky radiation, and (often) both of these reflected by Earth and terrestrial objects, like landforms and buildings. Sunlig ...

during winter at extreme latitudes can cause seasonal affective disorder (SAD), although a percentage of people experience SAD during summer. A solarium or other source of bright light may be used as light therapy to treat winter SAD.

Architecture and ergonomics

Where artificial lighting is used, this has to be sufficient to not only illuminate the task area, but also provide sufficient background lighting to avoid a sensation of gloominess which has a negative effect on efficiency. If the task is challenging, such as playing

cricket Cricket is a Bat-and-ball games, bat-and-ball game played between two Sports team, teams of eleven players on a cricket field, field, at the centre of which is a cricket pitch, pitch with a wicket at each end, each comprising two Bail (cr ...

, reaction times are found to increase significantly when the illumination declines to the ''gloom level''. In architecture, the level of lighting affects whether a building is considered to be unappealing. If there is little or no sunlight or view of the outdoor surroundings from within, then this will tend to make the building seem "gloomy". As seen from the exterior, an interior which is brighter than the surrounding light level may cause the overall building to seem gloomy because the normal cues and contrasts have been upset.

Artistic effect

In the arts, a gloomy landscape or setting may be used to illustrate themes such as melancholy or

poverty Poverty is a state or condition in which an individual lacks the financial resources and essentials for a basic standard of living. Poverty can have diverse Biophysical environmen ...

Horace Walpole Horatio Walpole, 4th Earl of Orford (; 24 September 1717 – 2 March 1797), better known as Horace Walpole, was an English Whig politician, writer, historian and antiquarian. He had Strawberry Hill House built in Twickenham, southwest London ...

coined the term ''gloomth'' to describe the ambiance of great ancient buildings which he recreated in the

Gothic revival Gothic Revival (also referred to as Victorian Gothic or neo-Gothic) is an Architectural style, architectural movement that after a gradual build-up beginning in the second half of the 17th century became a widespread movement in the first half ...

of his house, Strawberry Hill, and novel, ''

The Castle of Otranto ''The Castle of Otranto'' is a novel by Horace Walpole. First published in 1764, it is generally regarded as the first Gothic novel. In the second edition, Walpole applied the word 'Gothic' to the novel in the subtitle – ''A Gothic Story''. Se ...

''. Characters which exemplify a gloomy outlook include Eeyore, Marvin and Old Man Gloom. The catchphrase "doom and gloom", which is commonly used to express extreme

pessimism Pessimism is a mental attitude in which an undesirable outcome is anticipated from a given situation. Pessimists tend to focus on the negatives of life in general. A common question asked to test for pessimism is "Is the glass half empty or half ...

, was popularised by the movie '' Finian's Rainbow'' in which the leprechaun Og (

Tommy Steele Sir Thomas Hicks (born 17 December 1936), known professionally as Tommy Steele, is an English entertainer, regarded as Britain's first teen idol and rock and roll star. After being discovered at the 2i's Coffee Bar in Soho, London, Steele recor ...

) uses it repeatedly.

Weather

Gloomy conditions may arise when low cloud cover forms a continuous overcast. This occurs annually in

Southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...

, where it is known as June Gloom.

Anticyclone A high-pressure area, high, or anticyclone, is an area near the surface of a planet where the atmospheric pressure is greater than the pressure in the surrounding regions. Highs are middle-scale meteorological features that result from interpl ...

s may generate gloom-like conditions if they remain stationary, causing a haze and layer of stratocumulus clouds. These tend to occur in

temperate In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ran ...

winter at the

middle latitudes The middle latitudes, also called the mid-latitudes (sometimes spelled midlatitudes) or moderate latitudes, are spatial regions on either Hemispheres of Earth, hemisphere of Earth, located between the Tropic of Cancer (latitude ) and the Arctic ...

or over an extended period in

subtropical The subtropical zones or subtropics are geographical zone, geographical and Köppen climate classification, climate zones immediately to the Northern Hemisphere, north and Southern Hemisphere, south of the tropics. Geographically part of the Ge ...

regions.

References

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