A forest of stars is a set of star worlds whose adjacency matrix is a tree. This means that no intersecting star worlds create a cycle, or hole, in the overall space. If an object or space can be represented by a forest of stars, it can be mapped onto a sphere-world by mapping each star world onto the boundary of its parent star world in the adjacency tree. The root of an adjacency tree can be picked arbitrarily.

All star worlds in a forest of stars must have intersections that are also star worlds with respect to their center point.

Forests of stars are used in robot navigation to create navigation functions such as artificial potential functions. A forest of stars is used to represent robots or obstacles that have shapes which can be approximated by the union of separate stars.

A sphere world is a space whose boundary is a sphere of the same dimension as the space. A star world is any world whose boundary can be mapped onto the boundary of a sphere world. Since a forest of stars is the union of a number of star worlds, the forest can be recursively mapped onto a single sphere world, and then navigation techniques for sphere worlds can be used.

"A Forest" is a single by the English rock band The Cure, released on March 28, 1980 as the only single from their second album Seventeen Seconds. It was their first chart single in the UK, reaching #31; the song was also a hit in the Netherlands, reaching #26. It was also their first single to be released on the 12" single format, which was able to feature the un-edited album version. The 7" single version omits the initial guitar and keyboard introduction, removes a few bars between verses and fades out part way through the guitar solo ending, making it approximately two minutes shorter. Versions subsequently released on various compilations such as Standing on a Beach as the "single" version vary slightly from the 7" single edit in that they restore the guitar solo ending to its full length.

The lyrics tell a vague story about a man looking for a girl in a forest. He hears her calling for him, and as he chases her, he suddenly stops and realizes that he is lost and that the girl is not there. The song is fairly upbeat compared to the other material on the album, and Lol Tolhurst's machine-like steady beat together with Simon Gallup's minimalistic bassline gives this nervous chase more depth and keeps the song on the edge of a frantic groove until the end.^{[citation needed]} Former drummer for The Cure, Andy Anderson said A Forest was the first song by the band he ever heard. He "fell in love with it" and the song's vocals, Robert Smith's guitar work, and the keyboards, which he describes as "haunting." The drums, he believed were straightforward and "all that is needed on it."

Louis Aimé Augustin Le Prince (born Metz 28 August 1841, vanished 16 September 1890) was an inventor who is considered by many film historians^{[not specific enough to verify]} as the true father of motion pictures, who shot the first moving pictures on paper film using a single lens camera.

A Frenchman who also worked in the United Kingdom and the United States, Le Prince conducted his ground-breaking work in 1888 in the city of Leeds, West Yorkshire, England, UK.

In October 1888, Le Prince filmed moving picture sequences Roundhay Garden Scene and a Leeds Bridge street scene using his single-lens camera and Eastman's paper film. These were several years before the work of competing inventors such as Auguste and Louis Lumière and Thomas Edison.

He was never able to perform a planned public demonstration in the United States because he mysteriously vanished from a train on 16 September 1890. His body and luggage were never found, but, over a century later, a police archive was found to contain a photograph of a drowned man who could have been him.