Capacity is a glass sculpture by cross-disciplinary artist Annie Cattrell, made by her own breath to form the delicate structure of human lungs. Through their large surface area and permeability, lungs are indeed organs for capacity, holding, releasing and retaining air. To me, the glass lungs embody the fragility and permeability of being alive which is heightened by the material Annie Cattrell used, Borosilicate glass, normally used for manufacturing test tubes.
Do check out her other works navigating art, science and the poetic on the Royal Society of Sculptors website.