The invisibility and speed lead me think of Ninja. A Ninja or Shinobi (忍者) was a covert agent or mercenary of feudal Japan specializing in unorthodox arts of war. The functions of the ninja included espionage, sabotage, infiltration, and assassination, as well as open combat in certain situations. Ninja presents how people well play with hypocrisy, the dangerous, treacherous and unscrupulous are hardly to notice and see. Ninja is well present the idea of hypocrisy.
"Since any opaque object absorbs light, it produces a shadow in the space behind it. If the source of light is a point, an opaque surface cuts off all light striking it, producing a shadow of uniform density. An example is the casting of hand shadows on a wall.
If the source of light is larger than a point, the shadow varies in intensity, creating the umbra and penumbra. The former is that portion from which all rays of light are obscured, while the penumbra is the lighter part, not entirely hidden from the observer.
Spotlights, hand torches, and so on, are points of light. The latter of the two shadows is the more frequently encountered. Thus, in Ninjitsu, we strive to remain in the deepest shadow, the umbra, as this offers the best concealment." - Secrets of the Ninja
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