Bubble
Theoretically the perfect sphere: although it’s life is short, it doesn’t react well or easily to modification and it has limited practical strength, the ignominiously named bubble is in fact a complex example of natural physical laws.
Just as with the other objects, the generation of a sphere of exactly the right dimensions involved a combination of co-ordination, practice, and chance, although in very different proportions.
See also; object 31, object 5, object 36,