“Who to Believe” by French artist François Abelanet is a large scale optical illusion (anamorphosis) installed in front of Paris City Hall. When viewed from a specific angle (as shown above), the 100 meter long grass installation appears to be a much smaller three-dimensional sphere. However, at another angle (see below), the illusion is broken and the sphere becomes nothing more than a very oddly shaped road median. This French language video from Paris.fr shows how the installation was built.
Photos: Déborah Lesage
Via: Paris, Reddit
"Vous êtes ailleurs" ou à l'Hôtel de Ville ? by mairiedeparis