Ah, Sandro Sassoli's "world currency". Admittedly it was not easy for me to understand Giulia Arena
's English right away, but there it is.
was designed, as well as some previous ones with a similar appearance, by Luc Luycx and Laura Cretara.
To me a sun panel would make sense, as the Expo is not about nutrition only, but it is difficult to recognize, especially on a small surface such as the pill of a €2 coin. But I must say that I had that mental vision of a chocolate bar too, hehe.