The Vatican Museums ramped spiral staircase by Giuseppe Momo in The stairs are actually two separate helixes, one leading up and the other leading down, that twist together in a double helix formation.
COMPLEMENTARY: This is an example of complementary colors in an interior space. The wall surrounding the stairs is yellow, and the stars themselves are purple. Yellow and purple are complementary colors.
love this staircase. Obviously most homes wouldn't need multiple levels of stairs, but the circle and the circular stair case are kind of cool. Hard to get furniture up and down though. - My-House-My-Home