All geometers and watercolourists are passionate about their tools and materials!
Over the years I’ve acquired some splendid vintage compass sets, my favourites being these two K&E sets. For geometry layouts I prefer drawing paper with a very resistant, extra smooth surface, and for painting my preference is for acid free, age resistant, natural white watercolour paper (fine grain and rough).
My preferred watercolour brands are the professional range of Daniel Smith, in particular the Primatek range, Schmincke and Winsor & Newton. I mix and conserve paint in seashells gathered from beaches around the world. For each artwork, I might use up to twenty shells with differing shades and variations in hue. The brushes I generally use for painting are fine sable (sizes 5x0-1).