It may well be a small segment of the market; penguin fixated, uncannilly numerate, early readers that is, but my son falls firmly into it and this was the only advent calendar for him. OK, he's already a fan of '365 Penguins'the beaufifully designed picture book by Jean-Luc Frommental and Joelle Jolivet featuring a stylish family whose Frank Lloyd Wright designed home is overrun by determinedly un-housetrained penguins for a full year at the rate of one a day. Children unfamiliar with the book would find this calendar a strange entry into uncharted waters but maybe a pleasing one. The calendar is a sizable, and space demanding, pop up version of the family's house with the 24 doors letting us see into doors, windows, the chimney, even the bin, with each window revealing a penguin up to some antic or other, tucked into a flap at the top of the calandar is a little book with a rhyme for each of the 24 windows - these are not as well written as the book but have made my four year old roar with laughter fairly reliably. I'll admit that I love this calandar as much as my son does and that my only gripe is that a few of the flaps are a little keen to spring open unassisted. There is no religious content to this calendar whatsoever (yet: I'm writing this on day 10) which is fine by me but may put off others. If you like penguins and lovely graphic design this is the product for you. If you're not sure and you have time before you need to start opening those doors test your enjoyment of the '365 Penguins' book or its amusing pop up countdown offshoot '10 Penguins'before committing to a penguin based advent.