How do digital media (mobile phones, GPS, iPods, portable computers, internet, virtual realities, etc.) affect the way we perceive, inhabit and design space? Why do architects traditionally design, draw and map the visual, as opposed to other types of sensations of space (the sound, the smell, the texture, etc.)? Architecture is not only about the solid, material elements of space; it is also about the invisible, immaterial, intangible elements of space. This book examines the design, representation and reception of the ephemeral in architecture. It discusses how architects map and examine the spatial qualities that these elements create and questions whether - and if so, how - they take them into account in the designing process.