妙法蓮華經玄義 4.72

4.72

空處，用無礙三昧者，此定得出色籠，即果報無礙，未是空、假、中等無礙。餘如上說。

For the sphere of space, the unimpeded samādhi is used: this concentration manages to escape the cage of form, which is the unimpededness of retribution, but it is not yet the unimpededness of emptiness, the provisional, the Middle, and so forth. The rest is as explained above.