The fine line between the visible and invisible is a characteristic feature of our experience of the natural landscape. Our everyday perception of natural phenomena, in fact, is mostly linked to their immediate and apparent expression and is often unaware – unless we deliberately delve deeper – of the causes of certain events, or of what lies beyond the limit of the visible. This condition gives rise to a sense of mystery, fascination and reverence for nature, and this is why cognitive intervention in nature can often take the form of ‘revealing’ a hidden characteristic, peeling back the veil of the invisible for a moment in order to offer a new perception of everyday life. The work proposed to do this starting from one of the elements that most strongly characterises the Ticino landscape and imagination, namely Lake Ceresio: near the mouth of the Sovaglia river, where the Ceresio touches its minimum width, 13 balloons attached with ropes to as many buoys spaced at a regular distance of about 40 metres were raised to the sky to a height that exactly replicated the depth of the lake at that point. A section of the Ceresio was thus turned upside down for a few days in the sky, revealing to everyone the unexpected profile of its depths’.Prof. Martino Pedrozzi