What anatomy is labeled as letter A in the image below? 
Definitions:
Wavelength
The distance between successive peaks of a wave, typically used in the context of electromagnetic waves.
Hue
A color or shade in the spectrum, representing the type of light reflected from an object.
Perceptual Constancy
The brain's ability to recognize objects as remaining the same despite changes in distance, viewpoint, or lighting conditions.
Linear Perspective
A technique in visual art, particularly drawing and painting, to create the illusion of depth and distance on a flat surface, using converging parallel lines.
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