The along - track scanning radiometer, aboard Europe's ERS - 1, which measures minute variations in sea temperature, was developed at the SERC's Rutherford Appleton Laboratory (RAL) in Oxfordshire. (newscientist.com)
Peter van de Kamp's tool was astrometry, meaning he used precise measurements in the proper motion of the star to look for the presence of planets, finding minute variations on photographic plates that were consistent with the hypothesis. (reddots.space)
Through the decades, working on both plain and colored paper, he explored minute variations of concepts — expressive qualities of line, the potential for depth sensation through contrasting colors, the tension between center and the edges of a composition, and so on. (clyffordstillmuseum.org)