If we map the three centers onto the Big Mind framework, we get Big Mind, Big Heart, and then also Big Belly.
The head awakening gives serenity and wisdom, as shown in many traditional Buddha depictions. It is the seeing of all as Spirit.
The heart awakening gives love and compassion for all beings, independent on who they are or what they do, and is reflected in depictions of Avalokitesvara, Kuan Yin, Chenrezig, Kanzeon. It is the loving of all as Spirit.
The belly awakening gives a deep sense of all as Spirit at a physical level, with the whole body and emotions, a deep sense of safety, nurturing and comfort. This profund sense of physical well-being (in the midst of whatever else may be going on) is reflected in Hotei, the big bellied laughing Buddha. It is the feeling of all as Spirit.
In each case, Big refers to that which leaves nothing out. The nondual view embraces and goes beyond all polarities. The open heart is open to all beings without exception, and to all forms no matter their specifics. The belly awakening is an awakening into the fertile darkness that is the ground of all form, the womb of all form in its infinite richness.
The view, love and fertile darkness is the seeing, loving and feeling all as Spirit, as awake emptiness and form, beyond and embracing all polarities.