1. First, select appropriate human specimens, which are generally donated to scientific research and education, and have gone through legal procedures and consent.

2. Secondly, Thomas went through a series of preparatory work in the specimen room, such as cleaning and removing the hair on the surface, and conducting anatomy and anatomical research to better understand the structure and tissue of the human body.

3. Finally, Thomas used a special silica gel injection technique, during which the blood and body fluids of the specimen were gradually replaced by silica gel. This kind of silica gel is a synthetic material, as soft and transparent as human tissue. The specimen will be further processed, such as coating a special protective layer or dyeing, to improve the visibility and preservation of the specimen.