Final answer:
Very old style porcelain light fixtures reference antique lighting that often didn't require electrical boxes, using the insulating properties of porcelain for safety and durability, much like the valued designs of historic porcelain and enameled glassware.
Step-by-step explanation:
The mention of very old style porcelain light fixtures refers to a type of lighting that predates modern electrical systems. These fixtures were designed for simplicity and utility, often without the need for protective electrical boxes. In the past, materials like porcelain were favoured for their insulating properties and durability. Similar to how the Ming dynasty porcelain and enameled glass lamps were valued for their beauty and functional design, early lighting fixtures served both decorative and practical purposes.
The use of porcelain light fixtures without an electrical box signals a time when electrical safety standards were not as stringent, with installations being more prone to hazards. In modern settings, electrical boxes are used to house connections and protect them from external factors. While today we use a variety of materials like Pyrex or Duran for their insulating properties in various applications, including lighting, the charm and style of old style porcelain light fixtures still resonate with those who appreciate vintage designs.
At times, for historical consistency, these types of fixtures might be used in restorations or as stylistic choices, but contemporary installations would typically integrate modern safety features to meet current safety codes.