Left: direction/square 方, right: horizontal person as a flat version of 人, arrow 矢 (= An arrow ノ in the sky 天) - Better right: Two lying persons and big 大
Mnemonic
It develops in one direction, if the two lying persons [= the parents] (breed) something big, namely: into a clan/race.
This radical can be seen as a person 人 who has the right leg horizontal 一. He is thus lying. (Further radicals with "person" are: sitting 匕, sitting cross-legged 夂, kneeling ⺈, skilled 才, bending マ,卩, slumped 㔾 or husband 夫)
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