A model maker is a professional craftsperson who creates a 3-dimensional representation of a design or concept. A model may be an exact duplicate of the design or a simple mock-up of the general shape or concept. Some model makers specialize in scale models which allow portability of the model to a trade show or an architect or client's office. Other scale models are used in museum displays and in the movie special effects industry. Model makers work in many environments from private studio/shops to corporate design and engineering facilities to research laboratories.