Hammerheads are one of the top most dangerous sharks and that to dive amongst..... not for me thanks. I made a packt here with the sharks many years ago and that is that "if they stay in the sea - I will stay on dry land"".. Great photo nontheless and thanks for sharing.
There's an aesthetic impression of receding depth in this photo from the gradation of tone towards the light source above the water, and in the silhouettes of the fish.
Only the image of the shark has more form than just a silhouette. Hammerhead sharks as a species have made a great physiological investment in the perception of visual parallax. The shape of their head is very unique.
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