Thousands of optical glass fibres form a matrix and run parallel to each other between the two main surfaces of each block. The proportion of the fibres is very small (4%) compared to the total volume of the blocks. Moreover, these fibres mingle in the concrete because of their insignificant size, and they become a structural component as a kind of modest aggregate. Therefore, the surface of the blocks remains homogeneous concrete. In theory, a wall structure built from light-transmitting concrete can be several meters thick, because the fibres work without almost any loss in light up until 20 meters. Load-bearing structures can be also built of these blocks, since glass fibres do not have a negative effect on the well-known high compressive strength value of concrete. The blocks can be produced in various sizes and with embedded heat-isolation. Litracon™ was invented by Hungarian architect Áron LOSONCZI in 2001. (via LiTraCon™)