Dr. Ramon Jardí i Borràs’ pluviometer at the Fabra Observatory Fabra in Barcelona.

Lamb of God in the Sant Climent de Taüll mural painting, 12th century.

Barman notepad diagram.

A periodic tesellation due to Victor Ostromoukhov. The red and the yellow curve are locally indistinguishable from each other, and both fill the plane densely like a Peano curve. The yellow curve has a single connected component, whereas the red curve decays into three components, which are connected only at infinity.

Sent by my friend Modesto, arrow that problaby means “¡Pon la caja derecha, cojones!”

Sign in a light aircraft.

La vache qui rit, an image inside the same image, inside the same image… a childhood obsession.

Moroccan logotype.

Bilingual sign (“Perruqueria” and “Peluquería” for hairdresser in Catalan and Spanish).

Danger sign by a public fountain in Barcelona. The part of the body where the lightning points suggests how painful it can be to break the rules.