It's on glass alright... but I can see the glass.

this doesn't fit the theme

Why is taking a photo through aquarium glass, glass at a zoo on theme, but not through a bus window?

works for me author..............no difference that I can see...........pardon the pun....

I think because you can see the glass windows. I don't necessarily agree that a lot of the entries are on theme either.

EDIT: you could have easily taken this photo without being through a window and we would not know the difference.

I think the description of the contest is confusing, really... The idea, I believe, is that things should appear to float... hence, the aquarium would be allowed because it is quite obvious that there is glass there... but, the confusion makes this a valid shot indeed!

you've got glare from the camera so this doesn't really work--if you had cropped it above the bottom fish, it would work

I have to agree, sorry. The Glare ruined the shot.

Yup... glare throws me out too...