earthenware basin, alms bowl
缽 centers on a container made of fired clay: an earthenware basin or bowl, especially one used for collecting alms.
缽 combines 缶 (earthenware jar) with 本 (origin, root), likely indicating a basic clay vessel. The exact historical development is uncertain, but the components suggest a container made from fired earth.
The left side 缶 is a clay jar, and the right side 本 is a book. Picture a monk placing a book into a clay bowl as an offering: the bowl is an earthenware alms bowl.
For ハチ, imagine a bee (ハチ) landing on the rim of the earthenware bowl, attracted by a sweet offering inside.