These are bookends. The site is in Polish and I translated it... not much info to help, but I think the bricks are cardboard and the stone floor is cut from nubby egg carton material. Very clever surface texture idea.
Domus project 13-37: Water cistern with iron door http://pietrasupietra.blogspot.com/2012/01/construction-13-water-cistern.html - http://pietrasupietra.blogspot.com/2012/12/construction-37-brick-staircase-part-3.html The Domus project is the construction in scale 1:50 of an imaginary medieval palace. It's made of clay, stones, slate, wood and other construction materials in the style of rich genoese buildings from the middle of XIV century.