It is a lifestyle, a process, a way to approach everything.
Life can be lived as a designer, and that actually means something; it is a system for living.
Yet, one has to realize that this system, however beautifully designed, cannot be controlled. Life is freeform, and a designer's systematic approach to the design of life is one that is purely conceptual in all reality.
Life can be "designed" up to a point, but we each have to come to peace with the fact that its beauty exists within the unknown. This beauty is in life's fluidity, and the inability to tame it completely.