Scientific Explanation
Precise microscopic observation proved that embryos form organs gradually from undifferentiated cells. There was no "pre-formed miniature" inside.

The tiny man who believed perfection exists from the start
A microscope-sized tiny old man. Stubbornly claims "organisms are perfectly formed from the start and simply grow larger," refusing to acknowledge change or diversity. Lost his place when developmental biology observed gradual change through cell division.
Born from early microscope observations. Denied by the development of embryology.
Precise microscopic observation proved that embryos form organs gradually from undifferentiated cells. There was no "pre-formed miniature" inside.
The human tendency to see what we want to see. Researchers who "saw tiny humans" in microscopes had their vision clouded by expectation.
Catchphrase“Perfect from the beginning. No need to change.”
Carbon's diverse allotropes (diamond, graphite, etc.) are the ultimate refutation of preformationism.
“変化?そんなものは幻想だ。すべては最初から決まっている”
“精子の中に、私のような完璧な小人がいるのだ”
“成長とは、ただ大きくなることだ。中身は変わらない”
“多様性?…不純物の混入だろう”
“レーウェンフックの顕微鏡には、確かに私が見えたはずだ”
Hmph. Making noise about "growth" and "change" again?
Results change with this diagnosis? Absurd. Human nature is fixed from the start.
Homunculus: "Carbon, are you diamond or graphite? It must be decided from the start!"
Carbon: "Depending on temperature and pressure, the same atoms take completely different forms. That's allotropy."
Homunculus: "Wh-! The same thing in different forms? Such an unstable existence..."
Carbon: "Not unstable. Taking the optimal form for the environment—that's the beauty of chemistry."
...Perhaps it was I who feared change all along.
It's okay not to be "perfect from the start." Being able to change... that is hope.