Partly due, also, to the variety of climates in Japan, and the millennium encompassed between the first cultural import and the last, the result is extremely heterogeneous, but several practically universal features can nonetheless be found. First of all is the choice of materials, always wood in various forms (planks, straw, tree bark, paper, etc.) for almost all structures. Unlike both Western and some Chinese architecture, the use of stone is avoided except for certain specific uses, for example temple podia and pagoda foundations.