In this paper we review and integrate a set of findings on learning the transformation of a sliding first-order lever. a type of tool with a prominent role in minimal access surgery. Its kinematic transformation is characterized by the so-called fulcrum effect. the inversion of the movement direction of the tip of the lever relative to that of the hand for rotations. https://www.marcelovicente.com/product-category/via-color-remover-stain/