IDIOMS

artist's conception



Example: An illustration showing the extrapolated appearance of something for which the actual appearance is not known or cannot be seen.
2010, Alan Boss, The Crowded Universe: The Race to Find Life Beyond Earth, ISBN 0465020399, page 116:
  Artist's conception of hot gases flowing off the atmosphere of the first transiting planet, the hot Jupiter orbiting the star HD 209458.
Used other than as an idiom: see artist,‎ conception.
2008, M. Scott Norton, Human Resources Administration for Educational Leaders, ISBN 1452245274, page 81:
  The artist's conception and plan permit the artist to judge the correctness of various aspects of the work that gives the artist the ability to resolve problems that occur during its execution.