Timelapse of Ganzfeld construction

This video shows a timelapse of the construction of James Turrell’s Ganzfeld (‘Virtuality squared’ 2014) at the National Gallery of Australia as part of the ‘James Turrell: A Retrospective’ exhibition.
James Turrell’s Ganzfelds form his largest and most spectacular series to date. Each is specifically designed and constructed to fit to a space. The use of coved corners, inclined floors, uniformity of surface and controlled lighting causes a loss of depth perception on the part of the viewer.
James Turrell
Virtuality squared 2014
Ganzfeld: built space, LED lights
800 x 1400 x 1940.5 cm (overall)
Collection James Turrell
Video: National Gallery of Australia

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Where is the light source?

[@SuperAleaiactaest]

right!?