According to the prospectus

 

An increasing number of countries are going to considerable lengths to interest producers, designers and architects for their material. One unusual method had been initiated by the trade journal Nowy Kamieniarz and the „Stone“ Trade Fair, held in Poznań Nov. 26th to 29th 2014. The core of the idea was a workshop held during two days of the fair, at the end of which students were required to present their drafts in product design and architecture.

Source: www.stone-ideas.com