`Mathematical Science is the language of the unseen relations between things', wrote Ada Lovelace, mathematician and computer visionary. She had a home on Exmoor and this landscape is reimagined through a combination of science and poetics, also part of a collaboration with visual poet Tilla Brading, ADADA:landescape. Ada loved birds, especially song birds, and studied the theory of flight. In a series of poems about birds and flight some are designed like punch cards to isolate key words and create an alternative text for a woman's life. The third sequence explores, through a 21st century lens, various aspects of the 'unseen' which were of interest to Ada: these include the human body, computing, music, the imaginary, and dark matter. There is also an internet cut up and paste on the word `Ada' and copious notes. In Frances Presley's new exhilarating and intellectually stimulating collection, the life and work of Ada Lovelace - innovator in the science of computing, but also lover of birds and music - is both focus and trigger. The concepts of the seen and the unseen in science, poetry and social mores permeate this volume, including contemporary society's blindness to ecological destruction and the historical suppression of women. Creative tensions between the closed and open, the algorithmic and the intuitive, science and nature weave their way deftly through the book in a profusion of evocative and often witty allusions to birds, flight, landscape, architecture, computation and mathematics. Through ambiguous voices, shifts in time and location, quotation, word play, cut and paste, visual patterns and accompanying documentation, Presley gifts us a rousing, profound and multilayered poetic sequence.