Metamorphism
Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. The chemical components and crystal structures of the minerals making up the rock may change even though the rock remains a solid. Changes at or just beneath Earth's surface due to weathering and/or diagenesis are not classified as metamorphism. Metamorphism typically occurs between diagenesis 200°C, and melting 850°C.
Three types of metamorphism exist: contact, dynamic, and regional. Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism. Conversely, decreasing temperatures and pressure characterize retrograde metamorphism.
Solid state recrystalization and neocrystalization
Metamorphic rocks can change without melting. Heat causes atomic bonds to break, and the atoms move and form new bonds with other atoms, creating new minerals with different chemical components or crystalline structures (neocrystallization), or enabling recrystallization. When pressure is applied, somewhat flattened grains that orient in the same direction have a more stable configuration.
Hylomorphism (computer science)
In computer science, and in particular functional programming, a hylomorphism is a recursive function, corresponding to the composition of an anamorphism (which first builds a set of results; also known as 'unfolding') followed by a catamorphism (which then folds these results into a final return value). Fusion of these two recursive computations into a single recursive pattern then avoids building the intermediate data structure. This is an example of deforestation, a program optimization strategy. A related type of function is a metamorphism, which is a catamorphism followed by an anamorphism.
Formal definition
A hylomorphism 
can be defined in terms of its separate anamorphic and catamorphic parts.
The anamorphic part can be defined in terms of a unary function 
defining the list of elements in 
by repeated application ("unfolding"), and a predicate 
providing the terminating condition.
The catamorphic part can be defined as a combination of an initial value 
for the fold and a binary operator 
used to perform the fold.
Metamorphism (album)
Metamorphism is an album by Japanese noise musician Merzbow. The first 500 copies come in a marble box carved with the image of a fossilized ammonite.
Track listing
All music composed by Masami Akita.
Personnel
Release history
The marble box was made in India and the CD itself comes in a fabric pouch with an insert.
References
Podcasts:
