If, for example, you look carefully at a tree, you will not find that its shape is enclosed by a hard line. The light creeps round the edges of the trunk and of the masses of foliage in such a way that the outlines are softened or slightly blurred. It is the same with a figure seated in a room; here and there its edges may seem sharply cut out against the background, but in other parts the edges will seem to melt into the background. In other words, as we look at the figure, what we are most conscious of is not its outline, but its mass of color in relation to the other masses of color that surround it.