In the 18th century, the French discovered a new and different use for glass - social identity. The popularization of mirrors in Europe was due, in part, to a growing appreciation for light and optics. When used as decor, mirrors create the illusion of space. With their reflective nature, they offer additional lighting while making rooms appear larger and more spacious. However, because of their fragility, they were difficult to ship. Thus, only the wealthiest could afford them. As their popularity grew, the economy grew with them. Local mirror manufacturing centers began to pop up across Europe to meet demand. With increased availability, mirrors began to find their way into the homes of the middle class. They became symbolic not only of affluence but also of social image. Hand mirrors led people to ask "who am I?" and moved us into an age of self-reflection and introspection.