There were lots of models of Gaudi's buildings, and some great examples of how he came up with the shapes of his buildings. One way was to hang chains or string with weights from the ceiling.
This way of working enabled Gaudi to work with materials that were thinner that used previously in arches.
One of the apartments has been refurbished to look as it would have in the early 1910's.
complete with a sewing room!!!!
The inner courtyards provided lots of interesting corners as well.