Having slept rough in the middle of London for a short while, I can attest to the value of having somewhere safe to sleep. In my case it was a large, dense bush

Having slept rough in the middle of London for a short while, I can attest to the value of having somewhere safe to sleep. In my case it was a large, dense bush in the middle of Hyde Park (which I can still locate 40 years later on Google maps). If I had an inaccessible cave to sleep in, I would have jumped at the chance. Regarding the methodology they employed, I like it. 3d model of the unpainted cave surface, with directional lighting and eye tracker... A very sincere approximation of what the original artists experienced. One thing that has not yet been mentioned is the loss of colour and detail information (high frequency features) that comes with low light conditions. This natturaly filters out distracting detail and distracting colour. Many painter's used to (and still) employ such work conditions precisely for this reason.