A sphere
A Sphere in perspective off course is a perfect geometrical circle. And can be easily drawn with the freehand-circle method or a compass. Altough sometimes this is insufficient because more detail is required or because the spherical part must relate to another part. Therefore the following method. Start off by constructing diagonals and mid-point crosses in all planes. Use the center points and mid-points to construct 3 mid-planes. Again construct the diagonals and mid-point crosses in these planes. Be accurate and focuses or you’ll get lost in the maze of lines. Then draw the corresponding ellipses in all 3 mid-planes. Locate the maxima of each ellipse and draw a circle trough them. You can always measure how good you did with a compass or guide.

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