I love this slide
I had to share this. The first thing I saw was the humpback whale.
I flagged all four of the two white and two fainter blue objects forming the square in the 'hump' because of their symmetry and because I was convinced it was a simulated image. It wasn't... So lens or no lens? My vote goes 'no lens', but worth a look.
I wondered if it could be a galactic pile up...?