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ANTONI GAUDI ART AND ARCHITECTURE |
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"Figure 8. Diagrams and a transverse section illustrating how the helicoidal form of the roof of the Sagrada Familia schools was obtained by laying the tile surface on wooden cross beams (a, b, c ...) which teeter asymmetrically upon a central metal beam J as their ends follow the helix S-S. Projecting lips at the low points of the roof throw water free of the walls which, being perpendicular to the beams (a, b, c ...), are also helicoidal." ("Antonio Gaudi," by George R. Collins)
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