There's no doubt that it's a joke. Why (how) could anyone think otherwise? Even without reading the guestbook. The whole site is written tongue-in-cheek.

But, those cats are all actually in those containers for the photographs. They are not digitally manipulated as far as I can tell. it's far too easy to put a small cat into a large glass jar when compared to trying to Photoshop the same thing (glass effect easy, distorting cat much easier to do in real-life(tm))

I saw that site sometime last year and thought it was mildly funny. I forgot about it by the end of the day. The spiked cat-carrier was at least as funny (if anyone else has seen that before).

Bruno