so intuitively, so physically

1. Does "so intuitively, so physically," mean "simultaneously intuitively and physically" ?

2. Does "viewer could tune in to ancient responses to changes in the earth’s ambient light" mean "viewer could understand human ancient (his ancestors' reaction) responses to changes in the earth’s ambient light"?

3. Does "has to" in the last sentence is talking about something that has already happened? I mean has the artist already found a connection with the viewers’ felt physical and temporal experience? Thus, can it be replaced with "had to"?

Full context:

"In August 2001, they travelled to remote North East Greenland during the transition from twenty-four-hour daylight to the twilight onset of winter darkness. Using an instrument called a spectroradiometer, they measured the patterns of twenty-four-hour daylight at six-hourly intervals. At the same time, bio-monitoring equipment (ESR) was used to measure the physiological effects of their own bodies’ daily responses to the changing light. Back in Britain, the data was used to control an artificial daylight installation in a work called Polaria,8 where viewers were able to interact with the spectral patterns of Arctic light. Participants were given a white jacket and overshoes and sat in a room on a specially designed chair, which had conductivebronze plates in the armrests sensitive to the skin’s response, allowing their physiological feedback to trigger one of twenty-four artificial daylight states. White light altered subtly from blue to green or to warm yellow. Interacting with the environment so intuitively, so physically, the viewer could tune in to ancient responses to changes in the earth’s ambient light. There is something deeply moving about such an encounter with nature, even if it is at second remove. Digital technology is transforming art as it is science but to be other than alien, the artist has to find a connection with the viewers’ felt physical and temporal experience.