Using conventional means in an unconventional way
How does he do it?
Schindler’s buildings do not look like ordinary houses (Figure 1). His houses (of his plaster skin phase 1) have thin, flat roof planes that project out over walls of glass. The roofs seem to be weightless. Most architects think these buildings are built entirely out of steel, which is stronger than wood but also much more expensive. Some Schindler houses do have some steel (the McAlmon, Oliver and Buck houses, for example) but his plaster skin houses are predominantly wood 3,4. Schindler used the same wood framing system your house is built with (if you are in a wood house in the US), he just used it in his own way to create his own 
designs.