This was part of the Surrealism art movement where's artist, inspired in part by the ideas of the psychoanalysts Sigmund Freud and Carl Jung, investigated ways to express in art the world of dreams and the unconscious.
Dali, a Natural Surrealist, aimed for "concrete irrationality" in their naturalistic paintings of dreamlike scenes. In this realistically rendered landscape featuring three "decaying" watches, he created a haunting allegory of empty space where time has ended.
In the painting, Dali rendered every detail of this dreamscape with precise control, striving to make the world of his paintings as convincingly real as the most meticulously rendered landscape based on a real scene from nature.
It highlights Surrealists' dominant motivation was to bring the aspects of outer and inner "reality" together into a single position, in much the same way life's seemingly unrelated fragments combine in the vivid world of dreams.