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Book
Projecting Spirits : Speculation, Providence, and Early Modern Optical Media
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ISBN: 9781503631946 150363194X Year: 2022 Publisher: Stanford, CA : Stanford University Press,

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Abstract

The history of projected images at the turn of the seventeenth century reveals a changing perception of chance and order, contingency and form. In Projecting Spirits, Pasi Väliaho maps how the leading optical media of the period—the camera obscura and the magic lantern—developed in response to, and framed, the era's key intellectual dilemma of whether the world fell under God's providential care, or was subject to chance and open to speculating. As Väliaho shows, camera obscuras and magic lanterns were variously employed to give the world an intelligible and manageable design. Jesuit scholars embraced devices of projection as part of their pursuit of divine government, whilst the Royal Society fellows enlisted them in their quest for empirical knowledge as well as colonial expansion. Projections of light and shadow grew into critical metaphors in early responses to the turbulences of finance. In such instances, Väliaho argues, "projection" became an indispensable cognitive form to both assert providence, and to make sense of an economic reality that was gradually escaping from divine guidance. Drawing on a range of materials—philosophical, scientific and religious literature, visual arts, correspondence, poems, pamphlets, and illustrations—this provocative and inventive work expands our concept of the early media of projection, revealing how they spoke to early modern thinkers, and shaped a new, speculative concept of the world.


Book
A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse : The First Experimental Study of the Camera Obscura
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ISBN: 3319479903 3319479911 Year: 2016 Publisher: Cham : Springer International Publishing : Imprint: Springer,

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This book provides the first critical edition of Ibn al-Haytham’s On the Shape of the Eclipse with English translation and commentary, which records the first scientific analysis of the camera obscura. On the Shape of the Eclipse includes pioneering research on the conditions of formation of the image, in a time deemed to be committed to aniconism. It also provides an early attempt to merge the two branches of Ancient optics—the theory of light and theory of vision. What perhaps most strongly characterizes this treatise is the close interaction of a geometric analysis of light and experimental reasoning. Ibn al-Haytham conducted his experiments in a systematic way by varying all that could be changed: the shape and size of the aperture, the focal length of the camera obscura, the distance and shape of the celestial bodies. This way, he achieved a thorough understanding. This work represents a decisive step in both the history of optics and the application of the experimental method that was just as efficient in medieval Islam as today.

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