Silk cone shadows back projected

As part of the first attempts to film the cones’ shadows a year earlier I had bought some sheets of “opal” perspex, a milky acrylic normally used in light boxes, intending to form a large box for receiving shadows in plan and elevation. While technical issues meant this was put on hold, the perspex was on hand in my studio, enabling me to construct a more simple apparatus for back-filming objects.

I assembled a basic frame to support the perspex sheet which was then held by two trestle legs. This allows the camera to be positioned underneath the filming table, to record shadows cast bay the objects placed on its surface.

This clip shows the setting up of the cones for filming.

The clip at the top of this page shows a single day of filming – the intermittent cloud cover means that the shadows of the cones fade in and out. The clip below overlays four days of filming (using 50% opacity and “overlay” blending mode), to ensure that the cone shadows are relatively continuous. However, this gives the image a flickering effect, as one layer moves into and out of focus. There is also a slight doubling to the shadows as their length has changed due to the daily shift in the sun’s elevation relative to azimuth.

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