Onur Cobanli explains:
It is like an illusion; it is utterly useless for some but indeed it is valuable to many; an illusion is entertaining or it could even be educative. But in any case it is a proof that the caster understands the aesthetic preference of the audience, their needs and likes, and therefore valuable. It also works as a mental anchor to be remembered, to be recalled. But visual design alone can be frustrating, it needs to be supported by elemental and astral design magic for creation of better form, function and service around the product, design is stronger when more type of magic is involved, these magic include research, art, engineering, ethnography and more.