light in the shadow of flame

When a burning candle is exposed to sunlight, it casts a shadow on the window sill or on the wall in front of it. Interestingly, not only the outlines of the wax body are visible there, but also the flame itself, so are we dealing here with the shadow of the light? The process can be closely examined by looking through the flame at a small object. Then it turns out that flames have different levels of transparency at different points.

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