woo I like the idea behind this, tho personally the world reflected "within" is probably still within your manipulation -- putting things/pictures around the tank? Good picture and composition tho :)
I love the representation of the forground rocks on the sphere. The subject seems to draw the viewer into the depths of the 'inner world' you aptly describe. great focus and good use of centering the subject; it really directs all of my attention deeper because of that. 7