This incredible photo was taken by Alexander Semenov, and is part of a series of photos focused on polychaetes.  It obviously includes the lovely Eunice worm as well as the dreaded bristle and fire worms, which are generally well behaved reef inhabitants but are absolutely infuriating once you touch them.  The complexity and variations of different forms is on display here, and even though we are repulsed by them (perhaps evolutionary or biologically), up close they are beautiful and fascinating nonetheless.  Check out the entire series here.