Possible Clues:

• Realistic
• Like a living person
• It's very similar to the person in biography and made-up stuff about Boltzmann Constant
• Free from artificiality
• Realistic-looking
• Like some wax figures
• Natural
• Realistic precursor of a dome of many-coloured glass
• True-to-life
• Could be mistaken for the real thing, like figure in wax museum