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3 examples would be touch, light and chemical.
and the most common signal would be chemical.
Hope this helps! (:
It is known as Tower Triangulation. Hope this helps! :)
Explanation:
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<span>Like watercolor, the substance that can be applied in a translucent wash, that is well suited to large areas of flat, saturated color is called a gouache. It makes the colors opaque like an inert pigment which is colorless in paints. </span>