At first glance it seems hard to assign a key role to an architectural element that is isolated from a project, and one generally accepts that, if there is a protagonist, it must be related to its global conception, not to partial aspects. But a close reading of a work like the Congress Center of Aragón, aside from helping to understand it as a complex whose internal structure is perceived through the spatial connections and resonances among the pieces that form it, also allows acknowledging the meaning that one single principle can acquire through the mechanism of the series.

Although the glazing technique is centuries old, it only really broke through in the production of ceramic bricks in the first decades of the last century. At that time, glazed facing bricks firmly claimed their place in diverse architectural styles such as eclecticism, art nouveau, art deco and early modernism.