Isaac moves our Lego advent calendar onto the table every night before he goes to bed so we won't forget, first thing in the morning, to open a new door. After we have our new Lego toy put together, Isaac lovingly rearranges the entire scene. Sometimes several times in the day.
We now have not only a Lego chef, a Lego mail carrier, a Lego traffic barrier, and a Lego stoplight but also some kid-designed Lego decorations, inspired by the advent calendar (and note the lack of weapons!).