Caustics 1.1

Caustics 1.2

Caustics 1.2

Caustics 1.3

Caustics 1.5

“The metaphysician believes that he travels in a territory in which truth and falsehood are at stake. In reality, however, he has not asserted anything, but only expressed something, like an artist.”
Rudolf Carnap, The Elimination of Metaphysics through Logical Analysis of Language, qu. In Philosophy edited by David Papineau.