It seems a silly question but it doesn’t seem to make sense. If you stand in the middle of 4 light sources, one on each side while being the same distance from each one: how can they be strong enough to cast a shadow yet not strong enough to remove the competing shadow from the equally powerful light source?
In: Physics
I think your base assumption rests in the mind framing it as casting a shadow. Try to imagine the view with only one light, then a second light, and then the third. Notice how the shadow is reduced as each successive light is added. The shadow is always there, but may be reduced to a level where you are less likely to notice it.
Light is always additive. This adding of light always reduces the shadows, but it is pretty much always relative here in the real world.
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