Visual is a Javascript library for data visualization developed by the Statistical Institute of Catalonia (Idescat). It is based on popular open source solutions. Visual offers a simple interface that encapsulates the complexity of these solutions for the most common chart types. These are the slides of a workshop about Idescat Visual that I gave at CCCB (May 22nd, Barcelona) in the context of a series of data journalism sessions and the Big Bang Data Exhibition. In Catalan. Video available at http://vimeo.com/98022154