As Graphic designers we are fascinated by grids. Those invisible lines that no one see except as. But when have they appeared and how it is a difficult question. It seems that they have allays existed, ever since art was invented, and we see it really well in books.
It is amazing how those you think simple thinks actually hide mathematical formulas and complete order in the seemingly artistic chaos. And how it all took part in every artistic movement ever appeared in Europe. These and many more things you can find in the link below.