Engineers have no say as to what the concept looks like or does, but engineers figure out how to make it work. Engineering schools are found at major colleges and universities. Structural, electrical, computer science and mechanical engineering are the most common majors. Architects create atmosphere with the space that they design. They use drawings from illustrators and engineers to create buildings and spaces.
Interior designers focus on the interior of the space.
They are generally concerned about furniture, paint colors and material choices. Interior designers can play a very conventional role in a normal interior space, but they also design highly specialized themed spaces as well. Some specialize in selecting the very unique themed finishes in an attraction while others help to select the movie-like props that will go into an attraction. Interior designers have illustration skills, space planning skills, materials selection skills, and computer skills. They learn their trade at design schools.