Invisibility

Invisibility is the state of an object that cannot be seen. An object in this state is said to be invisible (literally, "not visible"). The term is often used in fantasy/science fiction, where objects cannot be seen by magical or technological means; however, its effects can also be demonstrated in the real world, particularly in physics and perceptual psychology classes.

Since objects can be seen by light in the visible spectrum from a source reflecting off their surfaces and hitting the viewer's eye, the most natural form of invisibility (whether real or fictional) is an object that neither reflects nor absorbs light (that is, it allows light to pass through it). This is known as transparency, and is seen in many naturally occurring materials (although no naturally occurring material is 100% transparent).

Invisibility perception depends on several optical and visual factors. For example, invisibility depends on the eyes of the observer and/or the instruments used. Thus an object can be classified as "invisible to" a person, animal, instrument, etc. In research on sensorial perception it has been shown that invisibility is perceived in cycles.

Invisible (Tilt song)

"Invisible" is a song by English electronic music group Tilt, which reached the UK top 20 charts when released in 1999. The song was co-written by Dominique Atkins, from Grace fame, who also provided the vocals.

Track listings and formats

Invisible (Skylar Grey song)

"Invisible" is the debut single by American recording artist Skylar Grey. It was officially first released on iTunes on August 9, 2011. She performed the track along with various other songs on her upcoming studio album at The Glass House on July 31, 2011, and the song earned placement in the official trailer for the Madonna-directed film W./E..

Composition

Grey comments on her writing process for "Invisible" by saying "Before I started writing this album, I felt like I had lost control of my life and didn't know who I was anymore. I needed to ground myself so I decided to spend some time in solitude, and in the process discovered my inner super hero. The album tells that story starting with 'Invisible', which is how I used to feel."

Critical reception

Popcrush rated the song a four out of five stars and commented positively on the song's emotion and feel by saying "her song is an ode to feeling alone in a crowded room and feeling like no one can see the real you. The song addresses the notion of image, and the battle between the real you vs. the you that people see. It’s weighty subject matter encased in a pop song, with the lyrics surrounded by beats are light and airy."Billboard positively received the track and called it a "gorgeous, vulnerable opening statement that stretches her talent for crafting quick melodies over a fully formed pop track. "Invisible" sheds light on Skylar's own compelling persona."

Cycle (album)

Cycle is an album by the Japanese noise musician Merzbow. It features recordings of Masami Akita's pet chickens. Material from this album was performed live at Radio Nova in Oslo, which was released as Mini Cycle / Yoshino Tamago / Yonos Bigfoot.

Track listing

All music composed by Masami Akita.

Personnel

References

Chain (algebraic topology)

In algebraic topology, a simplicial k-chain is a formal linear combination of k-simplices.

Integration on chains

Integration is defined on chains by taking the linear combination of integrals over the simplices in the chain with coefficients typically integers. The set of all k-chains forms a group and the sequence of these groups is called a chain complex.

Boundary operator on chains

The boundary of a chain is the linear combination of boundaries of the simplices in the chain. The boundary of a k-chain is a (k−1)-chain. Note that the boundary of a simplex is not a simplex, but a chain with coefficients 1 or −1 – thus chains are the closure of simplices under the boundary operator.

Example 1: The boundary of a path is the formal difference of its endpoints: it is a telescoping sum. To illustrate, if the 1-chain is a path from point to point , where , and are its constituent 1-simplices, then

Example 2: The boundary of the triangle is a formal sum of its edges with signs arranged to make the traversal of the boundary counterclockwise.

Cycle (music)

Cycle has several meanings in the field of music. Acoustically, it refers to one complete vibration, the base unit of Hertz being one cycle per second. Theoretically, an interval cycle is a collection of pitch classes created by a sequence of identical intervals. Individual pieces that aggregate into larger works are considered cycles, for example, the movements of a suite, symphony, sonata, or string quartet. This definition can apply to everything from settings of the Mass or a song cycle to an opera cycle. Cycle also applies to the complete performance of an individual composer's work in one genre.

Harmonic cycles—repeated sequences of a harmonic progression—are at the root of many musical genres, such as the twelve-bar blues. In compositions of this genre, the chord progression may be repeated indefinitely, with melodic and lyrical variation forming the musical interest. The form theme and variations is essentially of this type, but generally on a larger scale.

Composition using a tone row is another example of a cycle of pitch material, although it may be more difficult to hear because the variations are more diverse.