In piazza Parrocchia in Bolzano, a strange chessboard with an anomalous number of squares is the occasion for one of the ten signposts of the MIC project "Maths in the city". This one recalls the classical story of the invention of the chess game, thus posing the problem of exponential growth.
You can see here a photo from a different point of view.
© Fabiana Marchesini
foto di Fabiana Marchesini