Well, it depends: If your friend wants something dark-er, than blue, then I would pick purple. While blue can be a sort of brighter color for certain situations.
Freestanding Sculpture is unattached to the background and has space on all sides. It is also referred to as sculpture in round. Unlike relief, freestanding sculpture can be viewed from all sides.
Space Sequence
A museum tour guide is most likely to use a space sequence.