birds - 1280 x 960

Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. Around 10,000 living species makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic period, around 160 million years (Ma) ago. Paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Paleogene extinction event 65.5 Ma ago.

wall - 1280 x 960

A wall is a usually solid structure that defines and sometimes protects an area. Most commonly, a wall delineates a building and supports its superstructure, separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls.

black stage curtain - iphone 640 x 960

Theater drapes and stage curtains are large pieces of cloth that are designed to mask backstage areas from spectators. They come in various types, each designed for a different purpose, though most are made from black or other dark colored, light-absorbing material such as heavyweight velour.

black stage curtain - ipad 1024 x 1024

Theater drapes and stage curtains are large pieces of cloth that are designed to mask backstage areas from spectators. They come in various types, each designed for a different purpose, though most are made from black or other dark colored, light-absorbing material such as heavyweight velour.

black stage curtain - 1600 x 1200

Theater drapes and stage curtains are large pieces of cloth that are designed to mask backstage areas from spectators. They come in various types, each designed for a different purpose, though most are made from black or other dark colored, light-absorbing material such as heavyweight velour.

Circle - iphone 640 x 960

A circle is a simple shape of Euclidean geometry consisting of those points in a plane that are a given distance from a given point, the centre. The distance between any of the points and the centre is called the radius.

Circle - ipad 1024 x 1024

A circle is a simple shape of Euclidean geometry consisting of those points in a plane that are a given distance from a given point, the centre. The distance between any of the points and the centre is called the radius.

Circle - 1920 x 1080

A circle is a simple shape of Euclidean geometry consisting of those points in a plane that are a given distance from a given point, the centre. The distance between any of the points and the centre is called the radius.

viva calaca - 1680 x 1050

Viva Calaca! is an animation project by Ritxi Ostáriz, based on the Mexican Day of the Dead.

ufo - 1280 x 1024

A term originally coined by the military, an unidentified flying object (usually abbreviated to UFO or U.F.O.) is an unusual apparent anomaly in the sky that is not readily identifiable to the observer as any known object. While a small percentage remain unexplained, the majority of UFO sightings are often later identified as any number of various natural phenomenon or man-made objects.

target - iphone 640 x 960

A shooting sport is a competitive sport involving tests of proficiency (accuracy and speed) using various types of guns such as firearms and airguns (see archery for more information on shooting sports that make use of bows and arrows). Hunting is also a shooting sport, and indeed shooting live pigeons was an Olympic event (albeit only once, in 1900). The shooting sports are categorized by the type of firearm or target used.

target - ipad 1024 x 1024

A shooting sport is a competitive sport involving tests of proficiency (accuracy and speed) using various types of guns such as firearms and airguns (see archery for more information on shooting sports that make use of bows and arrows). Hunting is also a shooting sport, and indeed shooting live pigeons was an Olympic event (albeit only once, in 1900). The shooting sports are categorized by the type of firearm or target used.

target - 1920 x 1080

A shooting sport is a competitive sport involving tests of proficiency (accuracy and speed) using various types of guns such as firearms and airguns (see archery for more information on shooting sports that make use of bows and arrows). Hunting is also a shooting sport, and indeed shooting live pigeons was an Olympic event (albeit only once, in 1900). The shooting sports are categorized by the type of firearm or target used.

sand - 1280 x 1024

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz.

Abstract - 1600 x 1200

Abstract art uses a visual language of form, color and line to create a composition which may exist with a degree of independence from visual references in the world. Western art had been, from the Renaissance up to the middle of the 19th century, underpinned by the logic of perspective and an attempt to reproduce an illusion of visible reality. The arts of cultures other than the European had become accessible and showed alternative ways of describing visual experience to the artist. By the end of the 19th century many artists felt a need to create a new kind of art which would encompass the fundamental changes taking place in technology, science and philosophy. The sources from which individual artists drew their theoretical arguments were diverse, and reflected the social and intellectual preoccupations in all areas of Western culture at that time.

parachute - 1280 x 1024

A parachute is a device used to slow the motion of an object through an atmosphere by creating drag, or in the case of ram-air parachutes, aerodynamic lift. Parachutes are usually made out of light, strong cloth, originally silk, now most commonly nylon. Parachutes must slow an object's terminal vertical speed by a minimum 75% in order to be classified as such. Depending on the situation, parachutes are used with a variety of loads, including people, food, equipment, space capsules, and bombs.

katana - 1600 x 1200

The katana is one of the traditional Japanese swords worn by the samurai class of feudal Japan, also commonly referred to as a "samurai sword".

leaf - 2560 x 1600

A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants.

Typically a leaf is a thin, flattened organ borne above ground and specialized for photosynthesis, but many types of leaves are adapted in ways almost unrecognisable in those terms: not flat (such as many succulent leaves and conifers), not above ground (such as bulb scales), or without photosynthetic function (consider for example cataphylls, spines, and cotyledons).

Conversely, many structures of non-vascular plants, or even of some lichens, which are not plants at all, do look and function much like leaves. Furthermore, several structures found in vascular plants look like leaves but are not actually leaves; they have different structures and origins. Examples include phyllodes and phylloclades.

light study - iphone 640 x 960

Light or visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light has wavelength in a range from about 380 nanometres to about 740 nm, with a frequency range of about 405 THz to 790 THz. In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarisation, while its speed in a vacuum, 299,792,458 meters per second (about 300,000 kilometers per second), is one of the fundamental constants of nature.

Light, which is emitted and absorbed in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.

light study - ipad 1024 x 1024

Light or visible light is electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. Visible light has wavelength in a range from about 380 nanometres to about 740 nm, with a frequency range of about 405 THz to 790 THz. In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarisation, while its speed in a vacuum, 299,792,458 meters per second (about 300,000 kilometers per second), is one of the fundamental constants of nature.

Light, which is emitted and absorbed in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.