The last hundred years have seen a revolution in our understanding of ocean processes. I have selected a subset of seven topics. Technological developments generally led (rather than followed) new ideas. The advent of satellite remote sensing led to global sampling with adequate spatial sampling density (two quite different achievements, both of enormous consequence). Computers permitted the timely reduction of very large datasets of disparate observations into digestible displays, including also meaningful estimates of the uncertainties of the measured fields. Underlying all these development is a century of transition from grossly inadequate expeditionary sampling to an appreciation of a rational sampling strategy.