One of the defining properties of metals is the ability to reflect light with nearly perfect efficiency and fidelity from clean, polished metal surfaces. This property has made metallic mirrors an essential and valued accessory as well as the first optical instrument in daily use for more than 5000 years. As most budding physicists learn, the canonical description of reflection of light is given by Maxwell's equations; they describe the response of free electrons in a metal to an external field in terms of perfect screening of the electromagnetic field and consequent induced currents, which regenerate the field in the form of coherent reflection. Yet the microscopic description of the quantum mechanical interaction of light quanta, photons, with metals has been hardly explored. In this talk I will present the latest results on the coherent light-metal surface interactions probed by multi-photon multidimensional photoemission spectroscopy. A femtosecond laser pulse with ~2 eV photon energy excites electrons from a surface state below the Fermi level of single crystal Ag(111) surface by several quanta to an energy level above the vacuum potential, where it is emitted into the vacuum. The analysis of photoelectron distribution with respect to energy and momentum reveals features that are characteristic of an exciton, a quasiparticle not yet observed in metals. Further analysis with respect to time reveals the dynamics of this transient excitonic state, which is intimately responsible for the coherent response of metals.