To load the LightBox construal and its associated 'playsheet', invoke JS-EDEN, as at

http://jseden.dcs.warwick.ac.uk/scifest

and select Light Box from the Project List.

To exercise the construal, you click the buttons at the periphery to toggle on and off rays of light that originate from each 16 possible directions and locations disposed around the sides of the LightBox array. To change the configuration of mirrors, you can click on each of the 16 cells. The contents of a cell cycles through three possibilities - it can contain a forward facing mirror, a backfacing mirror or no mirror. You may need to allow a little time for the construal to respond to clicks when adjusting the mirror orientations.

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