right side out (inside out)

http://images.google.com/imgres?imgurl=http://www.stevepontinimaging.co.uk/gallery/slides/Mermaids%2520purse.jpg&imgrefurl=http://www.stevepontinimaging.co.uk/gallery/slides/Mermaids%2520purse.html&usg=__ttTKfAGOS3MXzXO-EU3Hr69_ZtQ=&h=540&w=405&sz=50&hl=en&start=13&um=1&tbnid=qNjLIZEAM2fAnM:&tbnh=132&tbnw=99&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DX%26um%3D1

http://images.google.com/imgres?imgurl=http://skybluetrades.net/ireland/images/026-mermaids-purse.jpg&imgrefurl=http://skybluetrades.net/ireland/day3.html&usg=__2ZD_PsYqyC2TNOLMl52mQcbTDLg=&h=886&w=1448&sz=123&hl=en&start=23&um=1&tbnid=uxuZyuZeT_2KcM:&tbnh=92&tbnw=150&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26ndsp%3D20%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DN%26start%3D20%26um%3D1

http://images.google.com/imgres?imgurl=http://calphotos.berkeley.edu/imgs/128x192/0000_0000/0106/1498.jpeg&imgrefurl=http://calphotos.berkeley.edu/browse_imgs/fish_com_19.html&usg=__rQo6nE4ydhHfTQa5GM-GSfrMJYM=&h=171&w=128&sz=47&hl=en&start=29&um=1&tbnid=EgqHLSqtITKfuM:&tbnh=100&tbnw=75&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26ndsp%3D20%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DN%26start%3D20%26um%3D1

http://images.google.com/imgres?imgurl=http://online.chabotcollege.edu/jyasaki/photogallery/stuffpics/P7290035.jpg&imgrefurl=http://online.chabotcollege.edu/jyasaki/photogallery/stuffpics/stuff_gallery.htm&usg=__wZG_hg3trbDbPuiGUIs4viw-Lfs=&h=768&w=1024&sz=243&hl=en&start=36&um=1&tbnid=XFmQd9obBs4R-M:&tbnh=113&tbnw=150&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26ndsp%3D20%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DN%26start%3D20%26um%3D1 (the kelp here remind me of when we lived on the old chinese Junk. Mandy and I would always tie a rope or string around the "kneck" of a kelp and keep it for a pet.)

http://images.google.com/imgres?imgurl=http://farm4.static.flickr.com/3405/3335463194_b130eef6db.jpg&imgrefurl=http://www.flickr.com/photos/gazzat/3335463194/&usg=__oLvts9KsHtNq0ZF07_WqrHDywrg=&h=333&w=500&sz=171&hl=en&start=64&um=1&tbnid=L9jwBiH2nSliAM:&tbnh=87&tbnw=130&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26ndsp%3D20%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DN%26start%3D60%26um%3D1

http://images.google.com/imgres?imgurl=http://www.carolscornwall.com/On%2520the%2520Beach/Fish-Lesser%2520Spotted%2520Dogfish-eggs-01-03-09.jpg&imgrefurl=http://www.carolscornwall.com/On%2520the%2520Beach/sea-fish.html&usg=__fd6Tvo2MOvGTstMDFIJum1sehyA=&h=600&w=800&sz=134&hl=en&start=73&um=1&tbnid=12uzLOy2ufUwBM:&tbnh=107&tbnw=143&prev=/images%3Fq%3Dmermaid%2527s%2Bpurse%26ndsp%3D20%26hl%3Den%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7SUNA%26sa%3DN%26start%3D60%26um%3D1

http://findarticles.com/p/articles/mi_m1134/is_6_108/ai_55127878/

Baby shark is born (can show it growing or whatever, however much works for the beggining of the book - I think it would be cool to show the mother shark laying the egg and stages and stuff.)
In wiggling free, it dislodges the mermaids purse, and it floats down to a treasure chest where a curious octopus lives.
The octopus bumps into it because it wasn't there before and it is transparent (and beautifull and wavey).
He looks through it.
Side.
Because of the way it is lodged, he has to manuever and swim quite a ways around and through a tunnel or something to get to the other side. He does and looks out through it. (yes, it is transparent this way too!)
Side.
He Sticks a tentacle through to his left side.
Left.
Then sticks his body out and his tentacle on the right side.
Right.
He goes around the long end of it.
Left side.
Then back
Right side.
He sticks his tentacle in it.
In.
Then pulls it out
Out.
The picture shows all of his squished inside the little purse.
Inside.
Then doing the "octopus thing" where he is little in one spot, but can squish himself through little holes while the rest of him deflates on one side while it inflates on the other, kind of like pushing a balloon through a small hole.
Outside.
He gets excited and starts playing with it less cautiously, and it boings, flinging him into the money in the chest, and it goes in the opposite dirrection, ending up where it started, tangled in seaweed, only this time inside out with a few coins in it.
Inside out.
some dainty hands pick it up, shake out the coins, and turn it right side out.
right side out.
Then it is used to put much better sea treasures in - like flowers and shells and stuff. A mermaid is strongly implied, maybe you see her tail or part of a shadow, but never completely shown - the octopus never really sees her - mermaids are fantasy to him in his world too. He looks in awe as he sees this beautifull thing he has explored, return to the world of fantasy from which it came.
(might leave the left, right, and right side out, out, and just have it inside out - the rest can be implied.)