function project($projections)
    {
        if (func_get_args() === 1) {
            $projections = (array) $projections;
        }

        if (!is_array($projections)) {
            $projections = func_get_args();
        }

        foreach ($projections as $projection) {
            $this->nodes->projections[] = $projection;
        }
        return $this;
    }