Among the key works featured in the exhibition at the Museo Nacional de Bellas Artes in Santiago, Señalamiento de tres espacios abiertos (Signalling of Three Open Spaces, 1968) stands out prominently. In this historic conceptual piece,Lamelas temporarily demarcates three areas of open space (such as a park or garden) using cardboard rectangles arranged in circles around natural elements. Through this simple visual gesture, the artist explores the ideas of space, gravity, and immaterial fall, demonstrating how an ephemeral intervention can alter our perception of the surrounding environment without physically changing it.