Figure 1.

Illustration of the role of hand gestures for the understanding of mathematical concepts. f(x) stands for a mathematical function (e.g., sin (x)) that is amenable to visualization (in this case, a 2D Cartesian representation). O₁ represents an active observer (character’s viewpoint), and O₂ represents a passive observer (observer’s viewpoint). The interface icon by the hand of O₁ and O₂ illustrates the strength of ‘embodied resonance’ elicited in each scenario. O₁ has a stronger degree of engagement with the graph and imagination of the graph rather than seeing the graph (as it is the case with O₂).