The aim was to create a fine concrete texture, looking like skin.
First the fine aggregate was poured into a frame. A layer of crinkled paper was put on top, and then the cast was filled with the coarse aggregate and filled up with the mix of cement and water.
unfortunately the concrete didn´t went all through the aggregate, so only parts of it came out with the skin-texture.
Probabely the mix was not liquid enough, or not shaked enough so it could reach the bottom of the course aggregate.