Describe what is happening at the molecular level when a gecko clings to a wall?

When a gecko clings to a wall, millions of tiny hair-like structures called setae on its feet come into contact with the surface. These setae split into even smaller bristles, or spatulae, which increase the surface area and allow for van der Waals forces to take effect. This intermolecular attraction between the spatulae and the wall's surface enables the gecko to adhere securely, allowing it to climb and cling effortlessly. The gecko can easily detach its feet by changing the angle of its toes, reducing the contact area and weakening the adhesive forces.