This month marks the 150th anniversary of the birth of acclaimed American architect, visionary, and social critic Frank Lloyd Wright -considered by many to be one of the greatest architects of his time.

As a pioneer of the term 'organic architecture', one of his most iconic representative works is Fallingwater, set upon a waterfall in rural Pennsylvania. From its unveiling, the scheme has evoked enduring reflection on the relationship between man, architecture, and most prominently in Frank Lloyd Wright's mind - nature.

Skinny houses have a wider appeal than their footprint would suggest. With cities becoming denser, and land becoming rare and expensive, architects are increasingly challenged to design in urban infill spaces previously overlooked. Although designing within these unusual parameters can be difficult, they often require an individual, sensitive response, which can often lead to innovative, playful, even inspiring results. With that in mind, here are 22 houses with a narrow footprint, and a broad impact.