The customer starts with a basic set. This already allows for plenty of buildings to be build with the included stones and construction sheets as well as creative free play.
The buildings on the last page of the historical construction sheet and further free play constructions can only be build with the stones of the next expansion set.

The number of stones and the variety of forms increases with every expansion set purchased. In addition, the stones become smaller and more delicate, developing, training, and enhancing fine motor skills.

There are endless possibilities of buildings as it is up to you to either build one of the models in the construction sheet or creating your own buildings.