Not this year!
Each year, Josiah goes into seclusion to produce his masterpiece. The door to his room is shut, and decorated with dire warnings against entry. Then the family is assembled, and the year's Nativity is (literally) unveiled.
Here is an overview of the whole scene. (Most or all of the pictures are click-to-enlarge.)
The grey pieces are used to suggest a rugged, rustic stable, perhaps more of a cave.
Perhaps your eyes are first drawn to the angel. Of course, there's no way to do a hovering angel, so Josiah used a light saber. He has been struggling to get this aspect of the Nativity right each year, and feels best about this year's version.
Beneath the angel, you see the little drummer boy, with his light-saber hilt drumsticks.
To the right, you see one of the Magi's camels, bearing treasure and saddle bags. In the foreground is the magi bearing myrrh.
The Magi, from right to left, are: myrrh, incense, and gold.
This represents the chest of gold (though jewels are included as well).
Of course, the shepherds came to worship the King (with their multicolored sheep).
(That's Obi-wan leading the sheep.)
Here are various views inside the stable/cave:
Here is BG enjoying the Nativity scene in his own way. We suspect him of various rearrangements not approved by the artist.