The dawn of the 20th century. Modern design is all about logic and practicality. The focal point of the design is on functionality and not on the form.
Many confuse modern style with contemporary styling as they both characterize sleek lines and smooth surfaces. But the difference in them is that contemporary is ever evolving while modern design came into radar in the early to mid 20th century.
Metal, chrome and glass are favorite choices among the likes of this style.