This work was designed as a Christmas present for 2018.
One by one you slide each tree-plate in turn. The only plate without a tree is the goal. As you slide each plate in the correct order, you will begin to feel that you can open the final lid. But it’s not that easy! This is an item using gravity, such as, “Box with a tree” in 2005, and “House with trees” in2010. If you know these products you may be able to manipulate the puzzle more easily.