An upside-down Christmas tree is meant to represent the Holy Trinity: the Father, the Son and the Holy Spirit. The custom is traced back to a 12th-century religious tradition of Central Europeans, who hung inverted trees decorated with candles.
In modern times, upside-down Christmas trees have become a trendy practice. Some retailers began suspending their trees to obtain more open space when stores were decorated for the holiday season. Homeowners developed an interest in this decor, and special trees became available that attach to the ceiling. In this position, more ornaments are at eye level. The arrangement opens up the room with the tree and provides extra space for stacking Christmas presents.