  Knowledge on nuclear cluster physics has increased considerably as nuclear
clustering remains one of the most fruitful domains of nuclear physics, facing
some of the greatest challenges and opportunities in the years ahead. The
occurrence of "exotic" shapes in light N=Z alpha-like nuclei and the evolution
of clustering from stability to the drip-lines are being investigated more and
more accurately both theoretically and experimentally. Experimental progresses
in understanding these questions were recently examined and will be further
revisited in this introductory talk: clustering aspects are, in particular,
discussed for light exotic nuclei with a large neutron excess such as
neutron-rich Oxygen isotopes with their complete spectrocopy.
