"To the great tree-loving fraternity we belong. We love trees with universal and unfeigned love, and all things that do grow under them or around them - the whole leaf and root tribe. Not alone when they are in their glory, but in whatever state they are - in leaf, or rimed with frost, or powdered with snow, or crystal-sheathed in ice, or in severe outline stripped and bare against a November sky - we love them."

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It is clear that everybody interested in science must be interested in world 3 objects. A physical scientist, to start with, may be interested mainly in world 1 objects--say crystals and X-rays. But very soon he must realize how much depends on our interpretation of the facts, that is, on our theories, and so on world 3 objects. Similarly, a historian of science, or a philosopher interested in science must be largely a student of world 3 objects.

— Karl Popper