Columbus' Egg is a popular expression that means that something very difficult to accomplish, seems very easy, once it has been accomplished.
Columbus' Egg is a metaphor used to claim that anyone could do the feat.
When the expression is used to say that a certain person has found his Columbus egg, we are saying that the person has discovered something that will be of great benefit to him.
expression source
Columbus' Egg is an expression that has two versions of its origin. In Spain, after the discovery of America, Columbus is honored at a banquet. Some present belittled the feat and claimed that any browser could do it.
Columbus challenged them to put an egg upright. As no one could, Columbus hit the egg on the table, crushing one of the ends, which made it possible the egg standing upright, and he added: "Anyone can do it, but first it is necessary that someone has the idea.
In Italy, some historians claim that it was the architect Filippo Brunelleschi who refused to show his design of the dome of the Cathedral of Santa Maria del Fiori, in Florence, and challenged some architects to lay an egg standing. When none of them could, Filippo hit the egg on the table, crushing one end, and the egg stood upright.
The architects claimed they could do the same, and Filippo said they could copy his design as well.