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DTSTART;VALUE=DATE:20191112
DTEND;VALUE=DATE:20191130
DTSTAMP:20260416T163259
CREATED:20210329T205510Z
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UID:2373-1573516800-1575071999@act.mit.edu
SUMMARY:Diffractions: Holography at the Center for Advanced Visual Studies
DESCRIPTION:Diffractions: Holography at the Center for Advanced Visual Studies\n On exhibit November 12 – 29\, 2019\n E15-223 \nWhat is a hologram? \nA hologram is a 2-dimensional image that contains all the 3-dimensional information of an object. When viewing a hologram\, you can tilt the image and see the orientation of the shape move. It’s as if you see the object in the picture from a different angle. \nThis is achieved through the interference patterns in light waves. The process involves using a laser — so all of the light has exactly the same wavelength — and reflecting it off of the object onto a film. \nHolography involves an encoding of the light field as an interference pattern of variations in the opacity\, density\, or surface profile of the photographic medium. When suitably lit by ambient or laser light\, the interference pattern diffracts the light and the objects exhibit visual depth cues such as parallax and perspective that change realistically with the relative position of the observer. That is\, the view of the image from different angles represents the subject viewed from similar angles. \nA number of CAVS fellows used holography in their art practice\, including Betsy Connors\, Attila Csaji\, Dov Eylath\, Friedrich St. Florian\, Susan Gamble\, Rockne Krebs\, Seth Riskin\, Don Thornton\, and Sally Weber. \nThe artists featured in this exhibit are \n\nPaula Dawson – Fellow 1994-1995\nHarriet Casdin-Silver – Research Affiliate & Fellow 1976-1985\nDieter Jung – Fellow 1985-1987\nSetsuko Ishii – Fellow 1981-1982\nLowry Burgess – Fellow 1971-1989\nEric Begleiter – Student & Fellow 1982-1985\nStephen Benton – CAVS Director 1996-2003\n\nTypes of Holograms \nLaser transmission holograms are viewed by shining laser light through them and looking at the reconstructed image from the side of the hologram opposite the source. (See work by Paula Dawson and Setsuko Ishii) \nRainbow transmission holograms\, invented by CAVS director Stephen Benton\, allows more convenient illumination by white light rather than by lasers. Rainbow holograms are commonly used for security and authentication\, for example\, on credit cards\, cash\, and product packaging. (See work by Stephen Benton\, and your wallet) \nReflection holograms are viewed using a white-light illumination source on the same side of the hologram as the viewer and is the type of hologram normally seen in holographic displays. They are also capable of multicolor-image reproduction. (See work by Harriet Casdin-Silver\, Eric Begleiter\, and Lowry Burgess) \nSolar Tracked holography\, pioneered by Harriet Casdin-Silver\, is a form of reflection holography that relies on the changing diffraction (bending) of sunlight to alter an image’s spectral colors. (See work by Harriet Casdin-Silver) \nComputer-generated holography is the method of digitally generating holographic interference patterns. A holographic image can be generated by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by suitable coherent light source. (See work by Dieter Jung) \nPhotographing a hologram \nBecause holograms depend on light diffraction for viewing\, every photograph of a hologram is slightly different depending on both the angle and the proximity of the photographer to the photograph. \nThe Center for Advanced Visual Studies Special Collection holds only images of holograms created by CAVS fellows. However The MIT Museum\, which holds the most comprehensive collection of holograms worldwide\, has many of the featured holograms in their collection. They are frequently on view in various exhibits. \nCurated by Project Archivist\, Thera Webb.
URL:https://act.mit.edu/event/diffractions-holography-at-the-center-for-advanced-visual-studies/
CATEGORIES:Events & Exhibitions
ATTACH;FMTTYPE=image/jpeg:https://act.mit.edu/wp-content/uploads/2021/03/holo1.jpeg
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