If you decide to purchase Dictionary of Water be aware that the title wants to be the author's personal interpretation of a seamless series of formally perfect images of the water of river Thames, with no trace of text or essay. Rich in details and superbly printed, it makes you think that if nature could speak a language, it's alphabet would look like this book. Dictionary of Water is therefore also a beautiful object, nicely bound and printed on a luxury heavy satin paper. Being a conceptual project, this work might disappoint readers who expect some sort of explanation guiding them inside the motivations and the purposes of the artist, but those who know Roni Horn's style will definitely appreciate it. My advice is to look carefully again and again at pictures after the first quick glance. Water has its forms, but also reflects colours and clearness of what's around, therefore giving the viewer a reference about the weather, the light, indirect clues of life and history flowing around the big moody river. Concentrate on the pictures, and let the book absorb you, without wondering too much about its meaning, just like when listening to music: this is the best way of appreciating Roni Horn's work.