An advent calendar was my immediate thought when I saw it.

Do you not have those in the US? Basically each window opens onto a Christmas scene, and for kids advent calendars usually have chocolate behind the windows.

http://www.google.co.uk/images?q=advent+calendar

If you're American, or if you live somewhere else where Christmas cards are a tradition, it's virtually guaranteed that you'll see a wall mural of received Christmas cards many, many times per year, especially at businesses but also in homes.

http://www.google.com/images?um=1&hl=en&biw=1608&...

It appears to be how the holidays of this season are celebrated around the world.

Found something: http://online.wsj.com/article/SB1000142405274870477460457603...

Javascript triumph over Flash :D