时显时隐

时 = 寸 + 日 : The sun asks Sherlock Holmes out for a coffee just inside the entrance of the space station. Looking at his pocket watch, Sherlock sees he has time, winks and "thumbs up".

时 = 寸 + 日 : Mnemonic symbol: a giant pocket watch.

显 = 业 + 日 : Marie Curie (xi) is dating the bullfrog (业) in the anthill (an3). There is a prominent (显) sun (日) floating over the bullfrog which Marie just cannot ignore, so she has to stare at the sun barely able to say anything for the whole evening.

隐 = 急 + 阝 : The pope (阝) and Maud Younger (y) both need to go to the bathroom in the encampment ((e)n3) urgently (急), but they both forgot the secret (隐) pass phrase so they cannot open the door.