However, some forces act on such a ball. Gravity attracts it and also other surfaces such as your car paint. The stronger the force attracting the ball, the more it becomes deformed. The ball dissolves on the surface if there is a strong interaction with a high-energy surface.
It is similar with the adhesive of adhesive tape and the surface on which you would like to attach the tape. Independently of the surface (and its individual surface energy), the adhesive will dissolve better in one case, worse in another. It glues more solidly in one case and less solidly in another. That is why primers are used for adhesive tape with backings that have low surface energy (for example, plastic). They increase the surface energy of the backing so that the adhesive adheres even more strongly.
Finger or ink?
You can stick your finger in again if you want to test the tack of adhesive tape. But the extent to which adhesive tape sticks to your finger does not say anything about the tack on the surface that you want to use it for. Your finger and a surface have quite different surface energy (unless you want to stick the adhesive tape to your finger, of course. Then you can also do the test with a plaster...).