Artists can create a feeling of unity when all parts (size, amount, or number) relate well with each other. The relationship of objects in comparison with each other is called proportion. For example, when drawing or sculpting the human figure, proportion can refer to the size of the head compared to the rest of the body. One of the most famous examples of the artistic use proportion is Michelangelo's masterpiece David:

This famous sculpture shows David with hands and a head that are disproportionately large. Michelangelo did this on purpose to emphasize David's physical strength.

While a genius like Michelangelo can play with proportion, most designers are careful to put elements together in ways that look balanced and natural. When elements are disproportionate, it can be jarring to the viewer. They may not be aware of what is wrong with a design, which may make it seem less attractive. Finding the correct proportions in a design is often a process of simple trial and error.

The shapes in the designs below all share a unity in proportion that help strengthen the design. Consider how each balances the different elements to create an appealing composition. For example, the nautilus shape in the center has tiny spaces that radiate out proportionally to larger ones, drawing the viewer's eye around the spiral.