We see in contrasts. Freedom from pain follows pain, and felicity is the more radiant after a period of misfortune. Happiness, that is to say, displaces unhappiness and is perhaps its recompense; what is certain is that, as antonyms, they are (at least in this world) inconceivable without each other. The contrast they form also underlies the tensions inherent in the works in this catalogue. Some take us straight from the pinnacle of happiness down into the abyss, while in others the gradients of ascent or descent are so gentle that no culmination is perceptible. What all oeuvres gathered in the book have in common is that they furnish the human being, a social creature, with an experience of resonance. Happiness and unhappiness reverberate between the art and the beholders, leaving, in the best case, a lasting impression. Opening the catalogue-a metaphor for the human condition materialized in paper-one overhears this serenely melancholy echo of the works.