Epistemic Artefact CK8_05_2018 and Epistemic Artefact CK2_2020_02 were exhibited in the artspace Officinet in Downtown Copenhagen in 2020. The pieces are composed of glass blanks fused together. The glass blanks were handmade from recycled container glass. The soda lime glass has the capacity to devitrify more than traditional semi-crystal glass in the fusing process. The devitrification transforms the glass from an amorphous to a crystalline structure, which adds opacity to the surface of the glass and highlights the shapes of the blanks in a way that emphasizes and accentuates the pattern composition of the finished artefact.