The phrase “walking on eggshells” is an idiom that is often used to describe a situation in which people must tread lightly around a sensitive topic for fear of offending someone or creating a volatile situation.
Literally walking on eggshells would require exceptional caution, incredible skill, and a sense of self-control that would be nothing short of amazing.Eggs are actually like an arch: they are a perfect structure with internal strength derived from the forces pushing inwards towards one another.
They will crack easily when you strike them against something, but as a structure unto themselves, the design is perfect.
The rounded ends create an arch at either end. So if you place your body weight directly onto them, with the force spread evenly, the dozen eggs can take your weight and support it.