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The answer is an insulator.
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The answer is basso continuo
From the Italian language sometimes abbreviated as b.c is a technique of self-composition and execution and essential from the Baroque period
The basso continuo is played for one or various instruments, typically and harmonic as the keyboard instruments or others as the harp or lute
with the voice of bass simultaneously in charge of an instrument of grave tessitura like the violoncello, bassoon, the viola da gamba, contrabass and sometimes contrabasso.
It also receives the name of simultaneous accompaniment
The positive and negative shapes in m. c. Escher's print sky and water I balance each other and are an example of<u> figure ground reversal.</u>
Sea and Sky The Dutch artist M. C. Escher's woodcut print I was initially published in June 1938. Birds and fish form a regular divide of the aircraft in this print.
The central, transitional area of both prints has the horizontal series of these components, which fit into one another like the parts of a jigsaw puzzle.
Birds and fish alternately serve as the foreground and background in this core layer, depending on whether the viewer's attention is drawn to light or dark parts.
In the upward direction, the birds become more three-dimensional, and in the downward direction, the fish. However, the fish and birds eventually lose their shapes as they go upward and below, respectively.
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