When fundamental ignorance arises, our mind has already moved away from clarity to its second level. What is fundamental ignorance? At this level or state, the mind, prior to entering clarity, is very calm and relaxed and totally free of thought — correct, incorrect, good, bad, painful, happy... .
To be more specific, the origin of mind is clarity; subsequently, within clarity, slight undulations begin to form; when these undulations appear, the first moment of fundamental ignorance is produced. Although the innate clarity of the mind remains unchanged at this time, fundamental ignorance has already separated from clear light to form our consciousness. Here fundamental ignorance is likened to a ripple in the ocean. Although the ripple is not yet a wave, the calm ocean surface is not quite the same and is showing signs of undercurrent.
Depicted from Luminous Wisdom Book Series : Suffering is just a Paper Tiger