The trilogy has been created throughout the french literal meaning "Empreinte" (English: imprint). Each track represents an imaginary "Empreinte" and each album is an "Empreinte" as a whole. In order to feed the concept in a sonic way, a large palette of sounds (footsteps, rain, printer, train, car, sand...) has been recorded then processed to be used in musical contexts, together connected to all the other electronic (synths, vocoder, fx...) and acoustic elements (drums, vocals, guitar, harp…).