Although concrete is the dominant material in the structure, it is left exposed mainly in the interior of the building, while on the outside it is covered with copper sheet metal combined with wooden joinery.
Being an expression of Finnish culture, the building uses extensively materials from Finnish nature, such as pine wood, copper, and natural rocks. Dipoli has 500 windows of which only four are identical. The architects originally planned for as little interference with the natural granite of the site as possible; but blasting the hard granite base rock inevitably fragmented it. The building is seen as a key example of organic architecture. This creation has been also a cultural endeavour by the two, so much so that Reima Pietilä himself said of the building:
«As in Samuel Beckett’s novels, there are no exposed trench marks of balance. The concept of a traditional balance of composition is redundant in the design aesthetics of Dipoli. (…) after the hill top was blasted the broken heaps of rock gave an initial image which one could follow with the slow, crawling motion of structure. The reptilian metaphoric image: the silhouetted dinosaur accentuating the rhythmic consistency of retardation.»