室(shi)(shi)內(nei)(nei)空(kong)(kong)間(jian)是由地(di)面(mian)(mian)、墻(qiang)面(mian)(mian)、頂(ding)面(mian)(mian)的(de)(de)圍合限定而(er)成，從而(er)確(que)定了室(shi)(shi)內(nei)(nei)空(kong)(kong)間(jian)的(de)(de)大小和(he)形狀(zhuang)。進行(xing)室(shi)(shi)內(nei)(nei)裝飾的(de)(de)目的(de)(de)是創造(zao)適用、美觀(guan)的(de)(de)室(shi)(shi)內(nei)(nei)環境，室(shi)(shi)內(nei)(nei)空(kong)(kong)間(jian)的(de)(de)地(di)面(mian)(mian)和(he)墻(qiang)面(mian)(mian)是襯托人和(he)家具、陳設的(de)(de)背(bei)景，而(er)頂(ding)面(mian)(mian)的(de)(de)差異使室(shi)(shi)內(nei)(nei)空(kong)(kong)間(jian)更富有(you)變化。