This videos are short animation (poetical études) generated by the geometrical moves of my "INS surface". It was recorded the moving sculptures with shadows and projected the forms to coloured and deformed by grids. Every point of YNI has a different characteristic (tangent). We can find analogies, since we can project or model many life situations on the surface stretched between these extreme points. My developed surface integrating a convex protrusion symbolising yes (Y), a concave recess suggesting no (N) and a straight line, providing impartiality (I). I place these curves in the three planes of space, on which I applied the surface I named YNI.