• 氵(water; liquid)
• 罙(deep into cave; enter cave depths)

Water flowing into a deep cave evokes the meaning of profundity.

• 广(roof; broad eaves)
• 廿(twenty; many times measure)
• 又(right hand; again; once more)

Under a roof, use your hand to measure back and forth many times to get accuracy.

• 尸(body lying down; prone body)
• 乚(hook; curve)

A ruler is imagined as a person lying straight with curved fingers marking the length.

• 氵(water; liquid)
• 罙(deep into cave; enter cave depths)

Water flowing into a deep cave evokes the meaning of profundity.

• 广(roof; broad eaves)
• 廿(twenty; many times measure)
• 又(right hand; again; once more)

Under a roof, use your hand to measure back and forth many times to get accuracy.

• 尸(body lying down; prone body)
• 乚(hook; curve)

A ruler is imagined as a person lying straight with curved fingers marking the length.