Bottom
心 (heart) — the indexing radical, in its full sitting-on-the-bottom form (not the
忄 left-side variant). Anchors
感 in the family of feeling-and-thought verbs:
想 (think/miss),
念 (think of),
恭 (respect). The heart is where the feeling lands —
感动 (be moved),
感觉 (feel),
感谢 (be grateful).