Right-handed artists could more easily have avoided casting shadows on their work, because engravings in prehistoric caves were lit from the left. | The tips of engraving tools and brushes indicate that these instruments were used by right-handed artists whose work was lit from the left. | The best lighting for most engravings suggests that they were made by right-handed people trying to avoid the shadow of their hands interfering with their work. | Right-handed artists try to avoid having the brush they are using interfere with the light source. |
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