The same picture could easily work for both directions with the shadow as is, provided the light source was in different locations. For it to be counter clockwise, the light source would have to be lower on the far side to cast it on this side of the picture. But yeah, you wouldn't see a side image of the shadow anyway if it were spinning clockwise as the light source would have to be more directly above. Either way, neither are perfect, but they both can easily work.
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<br>The reasons people are making up to only see it going one direction are more entertaining than the picture itself.
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<br>> And therefore has left and right are inversed while spin direction remains the same. The foot is farther away in the back, thus upper because of the perspective. However, this means that the shadow would be farther away in the back, which the mirror image fails to depict. Therefore, the mirror image, which you call shadow, does not in fact depict the realistic shadow of the dancer, as it is clear that the dancer spins clockwise.