geometric construction of the egg

Yesterday I had one of my inspirations for a job dedicated to Easter. The symbolic element I have considered is the egg ... quite trivial right? It doesn't matter, I like the idea I had and I want to carry it on; even if in the end the result should be disappointing it is a way to practice manually and, moreover, this inspiration led me to do some research, and these researches gave me the opportunity to learn a new thing.

The first thing I needed was to draw an egg, I didn't want to draw it randomly but to make a precise geometric egg, so I wondered if the geometric construction of the egg was possible. I looked back at my high school geometric design book and found the geometric construction of the ovolo, it wasn't what I was looking for, so I started searching on the net and I came to find the geometric definition, on a google knol (http: //knol.google.com/k/modello-d-uovo), from which I then made my drawing. From this drawing in the plan, to carry out my idea, I will have to derive a geometric construction to make the egg in three-dimensional space, but the two-dimensional drawing can be useful for many jobs.

Draw a circle, the diameter of the circle will determine the height of the egg.

Draw a vertical line that passes through the center (you do not see this line in my drawings because I used a 'guide' of the program forgetting to highlight it at the end), from the (upper) point where the line meets the circumference you start many straight lines (light blue in the drawing) that will meet the circumference at various points (the more straight lines, the more precise the drawing will be).

Focusing on the point of origin of the light blue lines, draw arcs of circles (in green in the drawing), these start from the intersection between the orange lines and the vertical line and must cross the reference light blue lines (those from which the orange straight lines from which the arcs start).

Mark with a red dot the intersections between the celestial lines and the relative arcs of circumference (as explained in the previous parenthesis).

Last step connect the dots with a curved line by hand or with the help of a curvilinear.