i was watching this documentary about Josef Ressel using the idea of a corkscrew-propeller for ships and it was said his regular day-job was working in a forest where they grew specially shaped trees for ship-building. here is an example but when i searched the web i really found nothing.

i did find posts where people, and wikipedia even said such as, "what are these strange trees? could they be made by people for furniture or ships, or just strange genetic anomalies?" posts such as this -to be fair, i took the above pic from here-, but Ressel lived in Austria in the 1800s, and the forests were well into full maturity when he was hired in his youth.

And what about much earlier civilizations like the Romans and Persians? People have been shaping trees for centuries in many countries. Some samples are here.

i do not mean to be broadining my question, but i think people have been shaping trees for many other things than just ship building, but i guess for the sake of this thread, i'm just wondering about these web pages about "mystery trees" that occur where ship building was done and there is a reluctance in connecting the two!!!

^^i ^^read ^^the ^^submission ^^rules, ^^if ^^i ^^missed ^^something ^^and ^^this ^^does ^^not ^^apply ^^here, ^^please ^^let ^^me ^^know ^^where ^^to ^^post ^^this ^^question ^^instead ^^of ^^just ^^deleting ^^it. ^^thank ^^you.