In the tradition of the painters of the Romantic movement, Sistiaga became interested in the question of transparency in painting, particularly starting with the painted film experiment ERE ERERA BALEIBU… The film evokes atomic matter imagined in full light; in 2022, following a 4K restoration of this film, the artist proposed an inverted version, as he had done at the beginning of the 1990s for his two films EN UN JARDÍN IMAGINADO and PAISAJE INQUITANTE-NOCTURNO. After all, is it light or dark between the atoms? A misguided question of an earthling!