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.