According to Jamgon Kongtrul, the founder of the Rimé movement, in his 19th century commentary to the Lojong slogan, "To see confusion as the four kayas, the sunyata protection is unsurpassable", when one meditates on ultimate "bodhicitta" and rests in a state where appearances simply appear but there is no clinging to them, the "dharmakaya" aspect is that all appearances are empty in nature, the "sambhogakāya" is that they appear with clarity, the "nirmanakaya" is that this emptiness and clarity occur together, and the natural "kāya" aspect is that these are inseparable.