Translucent concrete, also known as light transmitting concrete or LiTraCon, was developed in 2001 by Hungarian architect Aron Losonczi. It is produced by embedding 4-5% optical glass fibers into a concrete mixture. This allows light to pass through the concrete while maintaining comparable strength to regular concrete. Some potential future applications of translucent concrete include translucent inserts on front doors, illuminated sidewalks and stairwells, and light-transmitting subway walls. However, the high cost and complex manufacturing process that requires precise fiber alignment currently limit its widespread use.