This document discusses the sustainability of art objects in a changing context. It describes several artworks including a photo by Thomas Struth at the Museo del Prado in Madrid, the video installation "Revolution" by Jeffrey Shaw and Tjebbe van Tijen, and Paolo Veronese's painting "The Wedding at Cana". It also mentions the techniques and materials used to create and display these works, and questions whether their meanings can be preserved over time as technologies become obsolete.