Sunset Postcard

Share the sky above with someone far away. Artist Macarena Ruiz-Tagle created these conceptual art postcards as part of the 13th Venice Architecture Biennale. Hold the postcard up to the sky and peer through the Cyanometer, mark the corresponding hue, and share a thought or two before dropping it in the mail.

Horace-Bénédict de Saussure, a Swiss naturalist (1740–1799), is credited with inventing the cyanometer in 1789 during his expeditions in the Alps.

14.8 x 10.5 cm (5.83 x 4.13 in.)