def exposed(self, position):
        x, y, z = position
        for dx, dy, dz in FACES:
            if (x + dx, y + dy, z + dz) not in self.objects:
                return True
        return False
Returns False is given `position` is surrounded on all 6 sides by
dataset/ETHPy150Open traverseda/pycraft/pycraft/world.py/World.exposed