Rectus abdomininis: Stomach or "sit-up" muscle
Local color (A), reflected color (B): [INSERT IMAGE]
Reflected light (A), glare (B), and back lighting (C): [INSERT IMAGE]
Rhyming shapes/ negative and positive space: 
Scale: The proportion used in determining the relationship of a representation to that which it represents; a progressive classification as to size, amount, etc.
Scumbling: The softening of colors or outlines of a painting by covering with a film of dry opaque- or semi-opaque color by rubbing
Secondary (A) and primary (B) colors: (A)Orange, green and purple, (B)Red, yellow, and blue
Sfumato: The gradual bending of light into shadow
Silhouette: A drawing consisting of the outline of something, especially a human profile filled in with solid color and appearing dark against A light background, or vice versa
Smooth shade (1), switchbacks (2), stippling (3), cross hatch (4):
1) 2) 3) 4)
Storyboard: A series of sketches often with captions or words describing dialogue or narration
Subtlety: The quality or state of being so slight as to be difficult to detect or analyze; elusive; not immediately obvious; abstruse; able to make fine distinctions
Superimposition: To lay or place upon or over something, often transparently; a visual integration
Symmetry: Correspondence of form and arrangement of parts on opposite sides of a boundary, such as a plane or line, or around a point or axis
Tessellation: Covering a surface or plane (infinitely) without gaps or overlaps by a pattern of one or more congruent shapes
Thaumatropes: An animation device consisting of cards with different designs on either side, which, when turned, appear to blend into one image
Transparent and translucent: Capable of transmitting light so that objects or images can be seen as if there were no intervening material, or causing sufficient diffusion to eliminate perception of distinct images
Trapezius: Nect-to-arms-to-back or "shrugging" muscle
Two and three dimensional: Measures of spatial extent, especially width, height, or length
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