Building block comprising light transmitting fibres and a method for producing the same

The present invention relates to a building block (2) comprising embedded light transmitting fibres (6) in a cast material (4), where the fibers are arranged in the cast material from a first lateral surface (8) of the building block to an opposite second lateral surface (10) of the same, whereby a fiber end, respectively, is arranged to end up at a respective position (12) on the first lateral surface (8), and the other end of the fiber is arranged to end up at a respective position (14) on the second lateral surface, whereby the fibers (6), respectively, permits transfer of light through the building block emitted from a light source arranged behind either of the lateral surfaces (8, 10), that the cast material (4) and the embedded fibers (6) therein constitute a building block (2) with a homogeneous structure that can receive load and further that a plurality of fibers (6) are evenly distributed over substantially the whole lateral surface (8, 10), respectively, whereby light can be emitted from the evenly distributed fiber ends in positions (12, 14) over substantially the whole lateral surface. The present invention also relates to a method for producing a building block comprising embedded light transmitting fibers.