Some aspects of tong-len…
It invites me to find in myself the confusion I see in others, and see in others the clarity I find here.
It invites in a receptivity to any experience, even those I would rather not were here.
It invites in a sense of us, a sense of a seamless field we all happen within and as.
In other words, it helps me notice more of the fullness of who I am, as a human being, it gives a taste of fearlessness towards experience, and it releases identification out of content of experience, inviting me to notice what I already am.
In terms of the three centers, I see that it invites in a receptivity of mind, heart and feelings. Recognizing myself in others, opening my heart to all of us, and a felt sense of our shared humanity and existence.
Of course, all of this can be expressed in a more technical language, but why not stay with the simple words? Those that are a little closer to immediate experience.