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Glass is one of the most important discoveries of mankind. Originally used as a cutting tool, it has been around for about 75,000 years. The first records of glass making, however, date back to the Egyptian and Mesopotamian. Since then, the mastery of the manufacturing technique has been developing in different civilizations and nations until the Industrial Revolution popularized the material and allowed its production on a large scale. In architecture, glass was first used as a sealing element around 100 AD.

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Despite the initially slow and arduous process of molding glass into shape, mankind has used the material for thousands of years. According to archaeological evidence, the first human-made glass tools and jewelry were found in Eastern Mesopotamia and Egypt around 3500BC — and after the invention of the blowpipe in Syria in the 1st century BC and the Western Industrial Revolution made mass production easier, the material's signature traits of transparency and durability could finally be applied on a large scale in architecture and design.

Fast forward to the present day, and the use of glass for building facades and windows is well documented. But what about once we move inside? By treating glass for different levels of transparency, cleverly positioning it within a room, or employing its reflective surface to their advantage, interiors can benefit just as much from the material as exteriors.

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Cooking shows have never been more popular around the world than they are now. Whether from recipes, reality shows, or documentaries, writer Michael Pollan points out that it is not uncommon to spend more time watching than preparing our own food. This is a very curious phenomenon, as we can only imagine the tastes and smells on the other side of the screen, which the presenters often like to remind us. At the same time, when we watch something about the Middle Ages, polluted rivers, or nuclear disasters, we are relieved that there is no technology to transmit smells across the screen. In fact, when dealing with odors (more specifically the bad ones), we know how unpleasant it is to be in a space that doesn't smell good. When dealing with buildings, what are the main sources of bad smells and how can this affect our health and well-being?

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Diversifying the materials of an interior space can greatly improve its depth and visual interest. At the same time, adding partitions or other delineations of internal space can help organize flow, circulation, and visibility. Polycarbonate, a type of lightweight, durable thermoplastic, is an excellent medium for both functions.

In its raw form, polycarbonate is completely transparent, transmitting light with nearly the same efficacy as glass. However, it is also lighter and stronger than glass and tougher than other similar plastics such as acrylic, polystyrene, ABS, or nylon, making it a good choice for designers seeking durable, impact and fire resistant materials that still transmit light. Like glass, it is a natural UV filter and can be colored or tinted for translucency, yet it is also prized for its flexibility, allowing it to be shaped into any size or shape. Finally, it is easily recyclable because it liquefies rather than burning, making it at least more environmentally friendly than other thermoset plastics. For example, recycled polycarbonate can be chemically reacted with phenol in a recycling plant to produce monomers that can be turned back into plastic.

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Over the past few decades, interior spaces have become increasingly open and versatile. From the thick walls and multiple subdivisions of Palladian villas, for example, to today's free-standing and multi-functional plans, architecture attempts to combat obsolescence by providing consistently efficient environments for everyday life, considering both present and future use. And while Palladio's old villas can still accommodate a wide variety of functions and lifestyles, re-adapting their use without changing an inch of their original design, today, flexibility seems to be the recipe for extending the useful life of buildings as far as possible.

How, then, can we design spaces neutral and flexible enough to adapt to the evolving human being, while still accomplishing the needs that each person requires today? An ancient element could help redefine the way we conceive and inhabit space: curtains.

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