How do the billions of cells communicate in order to perform tasks? The cells exert force on their environment through movement—and in doing so, they communicate. They work as a group in order to infiltrate their environment, perform wound healing and the like. They sense the stiffness or softness of their surroundings and this helps them connect and organize their collective effort. But when the connection between cells is disturbed, a situation just like when cancer is initiated, can appear.