She arranged the books on the shelf in an artfully uneven way.
Tips
usage
A favorite of Chinese garden, architecture, and interior-design writing. The key idea is 'irregular but intentional' — randomness that pleases the eye, not mess. Don't use for genuinely chaotic arrangements.
memory
错落 = uneven/scattered; 致 here = 情致 (taste, charm). Literally 'uneven with taste' — unevenness that has been done right.