ambigram (noun): A typographical design or artform that may be read as one or more words, not only as presented, but also from another viewpoint, direction or orientation.
A seasonal design, with some not particularly seasonal typography (unlike, for instance, Christmas which managed to actually look ‘Christmassy’).
The two ‘E’s, plus the obvious symmetry of the central ‘S’, meant that although this one didn’t exactly design itself, when the solution did finally come, it was very clear. Of course, the capitalization is all over the place, but you can’t have everything, can you?