What's Your Favorite Tree Configuration?

Nothing says "happy holidays" like mathematical coordinate systems! This brilliant mashup shows Christmas trees plotted along different axes and dimensions. The regular Xmas/Ymas/Zmas trees are your basic 2D and 3D plots, but then we escalate to the fancy XYmas, YZmas, and XZmas trees showing the projection planes. The X²-Y²mas tree is for those who prefer hyperbolic coordinates, while the Z²mas tree—with its event horizon of ornaments—is clearly for physicists who want their festivities to have some gravitational pull. Personally, I prefer my holiday decorations in 11-dimensional string theory space, but my department keeps rejecting the budget requests.