This may seem like a soft question, but your response will tell your potential employer a lot about your passion and motivation. It can also help them to determine whether you will fit in with the company culture. Were you inspired by a favorite artist or a family member in the field? Are you more drawn to the opportunity to create art or to contribute to construction? Your response can also give the interviewer clues about what type of building you like to design. If you became an architect because you wanted to create lasting art works, your ideal process and product will look different than it might if you entered the field to design impressive skyscrapers or specific use buildings like sports stadiums or opera houses.