An Bord Pleanála is due to rule next month on the proposed memorial to victims of institutional abuse in the Garden of Remembrance.
The 'Journey of Light' design was chosen by a Government-appointed memorial committee set up following a recommendation by the Ryan Report.
The memorial would involve building a tunnel in the wall behind the Children of Lir statute, which would open into a new entrance from Parnell Street West.
The tunnel would be lit up at night and there would also be a water feature inside the Garden of Remembrance to signify healing.
But there were a number of objectors, who said it was inappropriate to combine the abuse memorial with the existing one commemorating 1916 and the struggle for independence.
Conservationists also objected to Parnell Square being used.
A two-day hearing before the planning appeals board finished today.