A game includes a pair of rackets for propelling and catching a projectile. The flexure is made from a single continuous material having a first and second flexure sections, with the second flexure section allowing translational movement in a direction perpendicular to that allowed by the first flexure section. The dimension of the circular object is calculated according to distances between the first and second sensors and between the second and third sensors. Furthermore the present invention provides methods for early diagnosis, prognosis and monitoring of the disease course of carcinomas and their precursor lesions as well as for the treatment of said lesions.