To me, simplicity does not mean 'complete lack of detail'. Simplicity is about finding the naturally occuring details, lines and imperfection (though 'perfection' is a matter of taste).
Simplicity is taking a 'less is more' approach: a few twigs in a lopsided vase or single wildflowers in old glass bottles.
It is when the eye is drawn to that which occurs naturally: the drape of unembellished fabric, or the graceful bend of a black-painted handrail in a white stairwell.
Simplicity can be found in new and old alike, whether it is in the slowly-formed chips, scratches and patina on a set of bowls or the steady flow of smoke rising from a joss stick.
It can be about natural colours, smooth flowing lines...
Or gently-mottled pottery and unironed sheets.
Simplicity is calm, inviting and uncomplicated.