A mobile is a type of kinetic sculpture constructed to take advantage of the principle of equilibrium. It consists of a number of rods, from which weighted objects or further rods hang. The objects hanging from the rods balance each other, so that the rods remain more or less horizontal. Each rod hangs from only one string, which gives it freedom to rotate about the string.
Mobiles are popular in the nursery, where they hang over cribs to give infant

Infant

A newborn or baby is the very young offspring of a human or other mammal. A newborn is an infant who is within hours, days, or up to a few weeks from birth. In medical contexts, newborn or neonate refers to an infant in the first 28 days after birth...

s something to entertain them and give them external visual stimulation

Stimulation

Stimulation is the action of various agents on nerves, muscles, or a sensory end organ, by which activity is evoked; especially, the nervous impulse produced by various agents on nerves, or a sensory end organ, by which the part connected with the nerve is thrown into a state of activity.The word...

. Mobiles have inspired many composer

Composer

A composer is a person who creates music, either by musical notation or oral tradition, for interpretation and performance, or through direct manipulation of sonic material through electronic media...

s, including Morton Feldman

Morton Feldman

Morton Feldman was an American composer, born in New York City.A major figure in 20th century music, Feldman was a pioneer of indeterminate music, a development associated with the experimental New York School of composers also including John Cage, Christian Wolff, and Earle Brown...

 and Earle Brown

Earle Brown

Earle Brown was an American composer who established his own formal and notational systems...

 who were inspired by Alexander Calder

Alexander Calder

Alexander Calder was an American sculptor and artist most famous for inventing mobile sculptures. In addition to mobile and stable sculpture, Alexander Calder also created paintings, lithographs, toys, tapestry, jewelry and household objects.-Childhood:Alexander "Sandy" Calder was born in Lawnton,...

's mobiles to create mobile-like indeterminate pieces. Frank Zappa

Frank Zappa

Frank Vincent Zappa was an American composer, singer-songwriter, electric guitarist, record producer and film director. In a career spanning more than 30 years, Zappa wrote rock, jazz, orchestral and musique concrète works. He also directed feature-length films and music videos, and designed...

 also claimed that his compositions were modelled on Calder mobiles.
The meaning of the term "mobile" as applied to sculpture has evolved since it was first suggested by Marcel Duchamp

Marcel Duchamp

Marcel Duchamp was a French artist whose work is most often associated with the Dadaist and Surrealist movements. Considered by some to be one of the most important artists of the 20th century, Duchamp's output influenced the development of post-World War I Western art...

 in 1931 to describe the early, mechanized creations of Alexander Calder

Alexander Calder

Alexander Calder was an American sculptor and artist most famous for inventing mobile sculptures. In addition to mobile and stable sculpture, Alexander Calder also created paintings, lithographs, toys, tapestry, jewelry and household objects.-Childhood:Alexander "Sandy" Calder was born in Lawnton,...

. At this point, "mobile" was synonymous with the term "kinetic art", describing sculptural works in which motion is a defining property. While motor or crank-driven moving sculptures may have initially prompted it, the word "mobile" later came to refer more specifically to Calder’s free-moving creations. Influenced by the abstract work of Piet Mondrian

Piet Mondrian

Pieter Cornelis "Piet" Mondriaan, after 1906 Mondrian , was a Dutch painter.He was an important contributor to the De Stijl art movement and group, which was founded by Theo van Doesburg. He evolved a non-representational form which he termed Neo-Plasticism...

, Joan Miró

Joan Miró

Joan Miró i Ferrà was a Spanish Catalan painter, sculptor, and ceramicist born in Barcelona.Earning international acclaim, his work has been interpreted as Surrealism, a sandbox for the subconscious mind, a re-creation of the childlike, and a manifestation of Catalan pride...

 and Sophie Taeuber-Arp

Sophie Taeuber-Arp

Sophie Taeuber-Arp was a Swiss artist, painter and sculptor. Born in Davos, Switzerland, Sophie Täuber began her art studies in her homeland, at the School of Applied Arts in St. Gallen...

, Calder in many respects invented an art form where objects (typically brightly coloured, abstract shapes fashioned from sheet metal) are connected by wire much like a balance scale. By the sequential attachment of additional objects, the final creation consists of many balanced parts joined by lengths of wire whose individual elements are capable of moving independently or as a whole when prompted by air movement or direct contact. Thus, "mobile" has become a more well-defined term referring to the many such hanging constructs Calder produced in a prolific manner between the 1930s and his death in 1976. A succinct definition of the term "mobile" in a visual art sense could be a type of kinetic sculpture in which an ensemble of balanced parts capable of motion are hung freely in space but which never come into contact with each other.

Similar works

Calder's work is the only one defined by the term "mobile", however two other notable artists worked on a similar concept. Man Ray

Man Ray

Man Ray , born Emmanuel Radnitzky, was an American artist who spent most of his career in Paris, France. Perhaps best described simply as a modernist, he was a significant contributor to both the Dada and Surrealist movements, although his ties to each were informal...

 experimented with this idea around 1920 and Bruno Munari

Bruno Munari

Bruno Munari was an Italian artist and designer, who contributed fundamentals to many fields of visual arts and non visual arts with his research on games, didactic method and creativity.-Biography:Bruno Munari was born in Milan but spent his...

 created his "Useless Machines" in 1933, made in cardboard and playful colors.

See also

• Whippletree, a device used to balance force among draught horses.
• Wind chime
  Wind chime
  Wind chimes are chimes constructed from suspended tubes, rods, bells or other objects and are often made of metal or wood. Wind chimes are usually hung outside of a building or residence, as a visual and aural garden ornament, and are to be played by the wind....