信箱

信 = 亻 + 言 : Marie Curie and Rosa Luxemburg are reading a letter of Karl Marx to the public in the encampment's bathroom. To make the message really come across to the people they use a megaphone.

箱 = ⺮ + 相 : Mnemonic symbol: suitcase.

Marie Curie (xi) and an ent (相) are carrying a very heavy suitcase (箱) in front of the anglepod (ang1) by shouldering a bamboo stick (⺮) with which they lift the suitcase.