成唯識論演祕 2.190

2.190

見佛相好色身生敬，此所見色但名顯色，無表示故。觸等准知。

Seeing the physical body of the Buddha adorned with marks and signs, reverence arises; this visible matter that is seen is merely called color-matter, because it has no communicative expression. Tangible matter and so forth should be understood accordingly.