註華嚴經題法界觀門頌 2.17

2.17

大海從魚躍，長空任鳥飛。義曰：空是真空，不礙幻色；色是幻色，不礙真空。故曰無礙。此則約能觀之智有無雙照，約所觀之境真俗雙融，不二而二以顯色空，二而不二明其無礙。以此為門，出生觀智，成立趣行之解。

The great ocean lets the fish leap; / The vast sky allows the birds to fly.
The meaning is: Emptiness is true emptiness, which does not obstruct illusory form; form is illusory form, which does not obstruct true emptiness. Therefore it is called unobstructed. This, regarding the contemplating wisdom, shines upon both existence and nonexistence; regarding the contemplated object, interfuses both the real and the conventional. Being non-dual yet dual, it manifests form and emptiness; being dual yet non-dual, it clarifies their unobstructedness. Using this as a gate, it gives rise to contemplative wisdom and establishes the understanding that proceeds to practice.