Welcome to Tinkercad!
About 20 years ago, I went off to college to study engineering. One of the classes that engineering students had to take was a drawing course that required us to use special pencils (not the familiar No. 2s) and rulers and straight edges to create hand-drawn schematics of various objects. We started out with simple designs like cubes and pyramids and moved slowly but surely into more advanced drawings. It was a fun class, but it was also very tedious. I could sometimes erase mistakes, but many times it was easier to just start over, especially when I discovered I’d made a measurement error early in a complex drawing.
At the end of the class, the instructor informed us that a special class was being offered ...