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This is related to a psychological phenomenon known as pareidolia, in which the brain recognizes familiar patterns in ambiguous information. It is the same effect that can cause people to see faces in clouds or familiar shapes in shadows.
Why the Mystery May Never Be Fully Resolved
Without access to the original photographic plate, detailed records from the photographer, or additional images from the same session, it may be impossible to determine exactly what created the unusual shape.
It could be a combination of clothing and shadows, movement during the exposure, a hidden photographic support, or another technical feature of early photography.
That uncertainty is what continues to make the portrait interesting. What was likely intended as an ordinary family keepsake has become a historical curiosity because of one small and ambiguous detail.
While the image may continue to inspire debate, the available explanations show how easily early photographic techniques and visual perception can create unusual effects. Sometimes, the most intriguing mysteries in old photographs may have perfectly ordinary explanations—even when the answer is no longer possible to confirm with certainty.