This modular bookcase can be arranged in several different ways to fit your space. From the description it seems as if two of the elements are included in the price, yet take note that it looks like three are shown in the above picture. Four would be needed to create a complete column or circular shape.
“The two elements that make it up can be alternated in such a way as to obtain a partitioning structure or a wall bookcase, or can simply be used to make up half-circles or columns.”
Aziz Sariyer, 2009