Final answer:
The third guideline for creating a successful room is balance, which refers to the even distribution of elements to achieve visual stability and harmony within a space. It is crucial in design in order to create an environment that feels balanced and aesthetically pleasing.
Step-by-step explanation:
When discussing the principles of creating a successful room or artwork, the third guideline is balance. This concept involves an even use of elements throughout the work to create a sense of stability and harmony. Balance can be achieved using symmetry, where two halves of a composition mirror each other to produce a sense of calm and order. It is an essential aspect of design that informs the visual weight distribution within a room, whether through the arrangement of furniture, use of colors, or placement of art pieces.
While other guidelines like proportion and rhythm are also important, balance specifically refers to how components in a space are distributed to achieve visual equilibrium. Artists can manipulate balance to direct the viewer's attention and to create a coherent and aesthetically pleasing environment. A balanced room feels right and welcomes its occupants, which is why it is one of the key principles in design.