Concrete-like lampshades are actually made from mushroom mycelium - Yanko Design
Briefly

Mycelium, the root system of mushrooms, is utilized in lamp designs by MushLume, creating eco-friendly products that are sustainable, biodegradable, and renewable, made with low energy and water usage.
MushLume grows mycelium in a hemp substrate within molds, heating and drying the structures to create various lamp designs, offering an environmentally conscious alternative to traditional materials like metal, plastic, or glass.
Read at Yanko Design - Modern Industrial Design News
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