Top-left
口 — one of four
口 in
器, also the indexing radical. Each of the four mouths represents a vessel or container; together they ring the central
犬 like four pots arrayed for guarding. The radical anchors
器 in the vessel-and-implement family alongside
嚣 (clamor),
吕 (paired). Top-left position fills the upper row with the bottom-left.