 The concept is highly theatrical with a large curtain (made from coloured marble) being drawn back by two "Famae" (both the work of Pierre-Étienne Monnot from designs by Le Gros) to reveal the protagonist.This curtain obscures the wall behind and creates the illusion that the monument has the rare quality of being free standing rather than attached to the wall as is the norm.The composition also makes use of the monument's location in the only chapel with a side entrance to the church (to the right of the monument) by turning several figures directly towards visitors entering from there and inviting them in – an effect which today is hard to appreciate as the door is no longer in use.