Drag the green dot to change the egg to fish.

See the construction:[br][url=https://youtu.be/JE-L0VarQzo]https://youtu.be/JE-L0VarQzo[/url] [br][br]Based on Robert Dixon's Mathographics[br][url=https://books.google.com.hk/books?id=1fDgb17bgBkC&lpg=PP1&pg=PA3#v=onepage&q&f=false]https://books.google.com.hk/books?id=1fDgb17bgBkC&lpg=PP1&pg=PA3#v=onepage&q&f=false[/url]