Digital reconstruction of Gaudí’s lost sounding board in Mallorca Cathedral

In 1901, Antoni Gaudí was commissioned to restore the liturgical elements of Mallorca Cathedral. Among his contributions was the design of a distinctive sounding board for the main pulpit, composed of three paraboliclooking surfaces. Although declared a Historic Monument, the structure was demolished in 1970, leaving only a sketch by Le Corbusier and a few historic photographs as evidence. Based on this limited documentation, this paper presents a digital and geometrical reconstruction of the sounding board using a methodological approach that combines analytical and descriptive geometry with digital modelling tools. The study focuses on reconstructing the geometric logic behind Gaudí’s design, particularly the parabolic surfaces, through a parabolic fitting method. This process enables a better understanding of the original form and proportions, while recovering a lost element of Gaudí’s architectural legacy through a rigorous and systematic reconstruction effort.