Right phonetic
莫 — supplies the sound (mò → mō, just vowel-tone shift; the wider series gives
模 mó,
膜 mó,
漠 mò,
暮 mù). Itself originally pictured the sun (
日) sinking among grass and trees, the moment of dusk. Faint semantic echo: in fading light you reach out and feel your way (
摸) — hand-by-touch where the eyes fail.
