Robert Rattray Tatlock, Royall Tyler, Spanish Art, An introductory Review of Architecture, Painting, Sculpture, Textiles, Ceramics, Woodwork, Metalwork, Londres, B. T. Batsford, 1927, p. 52. 

From now we shall be increasingly preoccupied with the church furniture, to which category two new classes of objects must be added, the Retable or Altar Screen and the new fashioned elaborate Choir Stalls. The churches have embarked on that career of accumulation of                « bric-a-brac » of all ages which a Spanish Church collect as a caddis worm does pebbles .