• HIGHLIGHT: the area on the subject where light is directly hitting or reflecting with the most intensity.
  
  
• CORE SHADOW: the dark band visible where light and shadow meet on an object
  
  
• CAST SHADOW:  shadow on the surface an object rests on, created by the object itself blocking the light from the source.
  
  
• SPECULAR HIGHLIGHT: a bright spot of light that reflects on shiny objects when illuminated by a hard light, a strong 3d visual cue.
  
  
• HARD LIGHT: light source that is relatively small and far away (such as the sun) and creates harsh, sharp-edged shadows and reveals textures.
  
  
• SOFT LIGHT: A light source that is relatively large and close to the subject that creates soft edged shadow transitions and conceals textures.

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