Pile up blocks until the tower collapses. But why does the tower always end up collapsing? Is it possible that it can be built ad infinitum? A study published in the International Journal of Solids and Structures explores the fascinating and complex dynamics of the stacking of blocks subjected to hazards. Carried out by Vincent Denoël, an engineer at the University of Liège, this research looks at the stochastic stability of stacks, providing crucial insights for engineering, construction and materials science.