To clone means to replace pixels on area where you paint with pixels from sampled (source) area (first you must choose source area).
We cannot see a light source even if 1 opaque material is blocking the light source. Opaque materials do not allow light to pass through them so we cannot see light through them but we can still see light reflected by them.
We need an source of light, an opaque object blocking the path of light, a screen behind the opaque object.
A source of light and an opaque object.
What you need is a light source and an opaque object to block the light.
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A shadow is formed when light is blocked by an opaque object. The shadow appears on the surface opposite the direction of the light source.
Opaque materials do not allow light to pass through them, making them impossible to see through. Common examples include wood, metal, and thick fabrics. Opaque objects create shadows when placed in front of a light source.
A shadow is cast by an opaque body the opposite side of the body from the source of illumination.
Translucent since it is possible to monitor blood flow and pulse rate by placing a light source and photo detector either side of a finger. Opaque means totally barring the passage of light.
Those objects are called opaque objects. They prevent light from passing through them, creating shadows when they block light from a source.