The bronze script of character Well Off is
The middle one is a bamboo sieve like the one below
The dots are rice particles or other grain particle after shelling. The two vertical lines on each sides are the arms of the person who is shaking the sieve. I don't know the top part, may be the person's upper body.
Ancient Chinese shell the grains by hitting the grain in a stone bowl similar as the one below
The middle is a wood mortar hitting the grain in the bowl, forcing shelling. After shelling, people pour the mixture of the rice or other grains with shell into the sieve to separate the grains from the shell. The grains are smaller, could drop through the holes, but the shell are kept in sieve.
The character original meaning is to shell the grain, and leave the shell.
The big seal script of the character is
Similar to the bronze script.
The small seal script of the character is
The pinyin for character 康 is Kang1.