Two extended acoustic improvisations of reductionist approaches recorded in the studio in Parede, Portugal in 2021 from the quartet of Ernesto Rodrigues on viola, Bruno Parrinha on bass clarinet, Andre Hencleeday on piano and Joao Valinho on percussion, guided by a poem from Rodrigues as they slowly and exquisitly explore a "Closed Window" and an "Open Window".

The concept of a spiegel, or mirror, is explored by this perceptively patient electroacoustic octet led by violist Ernesto Rodrigues, each of the 3 tracks an evolution of the first recorded improvisation, the 2nd "Spiegel" layering and reacting to the first recording, and the 3rd to the previous two, ultimately reflecting a conversation of 24 virtual musicians.