When we distinguish between the figure and the ground. The 'figure' is the foreground which stands out from the background, which is the 'ground'. This is when we separate the figure from the ground using a 'contour', a boundary between the two. It is usually perceived as belonging to the figure. Images which the contour can belong to the figure or the ground, are called reversible figures. e.g. vase + 2 faces. Camouflage is when the contour is indistinguishable. Culture can influence figure-ground organization.