Spain, Basque Country, Bilbao, Vista of the city from the Mount Artxanda viewpoint with the Guggenheim Museum, Iberdrola Tower and River Nervion prominent.

Spain, Basque Country, Bilbao, Mount Artxanda Park with the famous Bilbao sign in the background.

Education, School, Tools, Abacus or counting frame a calculating tool used primarily in parts of Asia for performing arithmetic processes.

Turkana man playing traditional mathematical game of Ajua.