I’ve arrived in the middle of a vast expanse of what looks like green LEGO plastic subdivided into fenced lots. Mozart’s “Turkish March” plays sourcelessly over a chorus of meowing cats and squeaking mice. A signpost with my name on it indicates that one of these lots of Gumby-colored virtual earth is mine, and it is embarrassingly barren. In contrast, the neighboring garden, belonging to a stranger going by Level12Arsonist, resembles a neon Eden, bulging with glowing vines, buzzing bugs,