Every Christmas tree has either an angel, or a star mounted on the peak.
The idea here is to create a angel/star with an embedded camera that faces the room, capturing the entire contents (adjusted witht he zoom feature). The 3 megapixel camera also features a long life lithium battery, 512 MB memory
card, flash, timer, light sensor and an automatic hybernation feature.
You set the camera to turn on every hour and take a snap of the room, then it goes back into hybernation.
By the end of the Christmas season (assuming the tree has been up for 2 weeks) the angel/star would have taken 336 pics, which can then be fashioned into a hasstle-free christmas album/timeline/flipbook.