The concept of ‘space’ has held a key role throughout twentieth century architectural theory and practice and continues to evolve and contribute to contemporary architectural discourse in the early decades of the twenty-first century. The earliest explicit introduction of the term as a principal architectural category has been dated to the early 1890s and attributed to a small group of German aesthetic philosophers. 1 Associated with Kant’s naming of ‘space’ and ‘time’ as our two a priori intuitions, this use of the term space embraced its dual meaning both as a mental property and as a physical extension or dimension. It therefore associated architectural creation and architectural aesthetics with the human subject and was directly linked with the development of psychological aesthetics and a ‘scientific’ approach to art history. 2