Staircase yog qhov yuav tsum tau muaj nyob rau hauv lub tsev ob-thiab peb-zaj dab neeg. Feem ntau, cov qauv no yog rotary. Ntawd yog, lawv muaj ob lub platforms interfloor lossis hla teb chaws. Stairs nrog 90 degree tig, tau kawg, yuav tsum tau tsim kom zoo thiab sib sau ua ke