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In classical ballet, aplomb refers to the basic law of ballet – stability.
A 1905 book Grammar of the Art of Dancing, Theoretical and Practical referring to Bernhard Klemm, wrote: "Aplomb is the absolute safety in rising and falling back which results from the perpendicular attitude of the upper body and the artistic placing of the feet. By means of aplomb the dancer acquires a precision and an elegance which ensure the successful execution of every foot-movement, however artistic and difficult, and thereby creates a pleasing and a satisfactory impression upon the observer. Aplomb may be compared with the sureness of touch of the pianist." 
Aplomb is achieved with straight body with its weight equally distributed over the supporting foot (or feet). Aplomb is controlled by feeling and controlling the muscular sensations in the spine, i.e., by "holding the back".  The base of aplomb are the five positions of the feet codified by Pierre Beauchamp in 1680.
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