This book asks if we have a constitutional right to see or sense our surroundings with technology.   Do we have a constitutional right to record our surroundings with cameras embedded in smartphones or drones?   Or to enhance our vision with extended reality technology, bionic eyes, or brain-computer interfaces? Courts in the United States have already provided a possible foundation for answering such questions.   There is, they have said, a right to document matters of public concern by creating and sharing recordings with others.   Such recordings extend our perception: They let us watch events that are remote in space and time.   Yet sharing them is also a kind of communication and thus, the creation of "speech" protected by the First Amendment.   So too might be other ways of seeing with technology. This emerging case law raises interesting questions and challenges, such as how enhancement of our perceptions can leave room for others& privacy. This book explores such questions, focusing on American constitutional jurisprudence. It also argues that, in doing so, it is helpful to recognize that our interest in using and enhancing our perceptual power isn&t only an interest in doing so as part of First Amendment communication.   It is also linked closely to other rights - to personal integrity and the liberty to use our body&s perceptual powers and to the constitution&s protection for freedom of thought or what some scholars call "cognitive liberty:" Our exercise of perception and our use of it to learn about our surroundings is a crucial part of exercising our and shaping our mind.