My husband and I walked 150 miles from Ponferrada to Santiago de Compostella.
The shell represents the peregrinos (pilgrims) who over centuries have walked this path to get to Santiago. The whole pilgrimage is about 500 hundred miles. People walk all of it of part or it like we did.
The middle photo of the shell is the original that was found underneath part of the church in the 12th century. Shells were given to the peregrinos when they arrived at their destination. The shells are the way-markers that lead you to Santiago de Compostella. This photo is a collage of some of the way-makers that we encountered along the way. Now pilgrims buy the shells (conchas) and put it on their backpacks as they walk all those miles.