Chilean-born and Berlin based artist Macarena Ruiz-Tagle creates wonderfully minimal installations, often playing with space, light and the eye. In her latest work she pays tribute to the Cynameter in her Cynameter Postcard series. 

The Cyanometer Postcard refers to the variations of blueness when looking at the sky on a certain moment, to write this information down and share it with the receiver. It seeks to communicate senders and receivers across the latitudes of the world when thinking about the sky.