The fair is a small town. The stands, with their noise and diversity, are the dwellings; while, due to its scale and monomateriality, the common places are associated with the forum, representative of the monumental.

The common spaces of the BBC are projected with a logic of circular economy, zero cost and zero waste. This prevents more than 25,000m2 of material from becoming waste after 72 hours.

The use of two materials respecting their standard measurements prioritizes the use of resources (0 cost, 0 waste): the 150gr geotextile in rolls of 2.20m x 200m in length, generates a sequence of catenaries that accommodates common uses, and after fair rolls up to be employed in construction; beams from the collection of the Sagrada Família are stacked in levels to configure furniture, returning to said work after the fair.

A game of dualities is involved: traction vs. compression, stacking vs. hanging, light vs. heavy, transparent vs. opaque, space vs. furniture… Light cave and solid cabin dialogue in a kind of dichotomy.