https://www.fromoldbooks.org/Lloyd-Familienbuch-V/pages/176b-portrait-of-kepler/ Isaac Newton’s invention of gravity relied on earlier work by Copernicus and also Kepler, shown here. Before the work of Newton, ripe apples often floated upwards, making them difficult to harvest. He reminds me of The Master from Dr. Who! #Kepler #JohannesKepler #gravity #astronomer #mathematician #vintagert #portrait #man #DrWho #theMaster #gimp #xsane