I take this from the Amazon review of the book, The View from the Tower, a book I recommend, if you are interested in this subject.
Book Description of The View from the Tower:
Immediately after World War I, four major European and American poets and thinkers--W. B. Yeats, Robinson Jeffers, R. M. Rilke, and C. G. Jung--moved into towers as their principal habitations. Taking this striking coincidence as its starting point, this book sets out to locate modern turriphilia in its cultural context and to explore the biographical circumstances that motivated the four writers to choose their unusual retreats. From the ziggurats of ancient Mesopotamia to the ivory towers of the fin de si cle, the author traces the emergence of a variety of symbolic associations with the proud towers of the past, ranging from spirituality and intellect to sexuality and sequestration.
But in every case the tower served both literally and symbolically as a refuge from the urban modernism with whose values the four writers found themselves at odds. While the classic modernists (Eliot, Woolf, Hart Crane) often singled out the broken tower as the image of a crumbling past, these writers actualized their powerful visions: Yeats and Rilke moved into medieval towers in Ireland and Switzerland, while Jeffers and Jung built themselves towers at Carmel and Bollingen as secluded spaces in which to cultivate the traditions and values they cherished. The last chapter traces this perseverance of the ancient image through its heyday in the twenties and into the present, where it has undergone renewal, institutionalization, and parody.
The corner gives you a photo from Robinson Jeffer's Tor House in Carmel. He built it himself, using rocks from the beach.