盡人皆知

尽 = ⺀ + 尺 : Someone or something is using up all the blossoms in the encampment's bathroom, each day one more is missing. Joan of Arc wants to find out when they will be used up, so each day, she measures the remaining blossoms with a tape-measure.

人 = 丿 + ㇏ : Mnemonic symbol: Neanderthal Man (人). Robinson Crusoe (r-) is looking for snacks in the encampment's kitchen (-en2) when he suddenly spots Neanderthal Man (人). Neanderthal Man offers him a banana (丿), but Robinson Crusoe doesn't trust the present and pokes it with a finger (㇏).

皆 = 比 + 白 : Joan of Arc (ji) wants to be known by everyone (皆). To make sure to reach her goal she wears a bikini (比) in front of the elevator (e1) and inspects herself in a hand mirror (白).

知 = 口 + 矢 : Mnemonic symbol: Francis Bacon is attributed to have stated "scientia potentia est", "knowledge is power". I'll thus represent 知 by Francis Bacon. Francis Bacon (知) and James II of England (zh) are playing darts (矢) in front of the space station (Ø1). Because they lack a dart board they just use a mandarin (口).