It took 18 months to create the light projections
This light projection was part of a £7 million project to help restore and transform St Albans Cathedral.
This is quite the special project.
According to Wikipedia https://en.wikipedia.org/wiki/Edmund_Beckett,_1st_Baron_Grim..., "inspiring the creation and temporary popularity of the verb "to grimthorpe", meaning to carry out unsympathetic restorations of ancient buildings".
It situated a wire sculpture between the observer and a set of old ruins. The wire sculpture was positioned in such a way that it appeared to delimit the bounds of the ruined structure as it would have been original built when the observer was in the correct position. It was, like this, a non-contact way of enhancing an existing artifact.
quite literally