When he died in 1984, he was still working on what had become one of the world's grandest architectural fantasies.
He found himself agreeing with the young architect that this was no place to put an architectural fantasy of this kind.
Each is actually a private villa: the architectural fantasy of its owner, realised in brick, timber, concrete or glass.
But the collective projection of architectural fantasies bears scrutiny as it is happening.
The regiments marched before an architectural fantasy: a "London Bridge" as it might appear in a picture book for children.
California's David Em is well known for his architectural fantasies and abstractions.
Irving's Tarrytown home, Sunnyside, is something of an architectural fantasy itself.
These lively architectural fantasies emphasize the power of built space not only to shelter the body but also to resonate in the psyche.
Today his "architectural fantasies" - like the interpretation of mechanical forms shown here - are influencing a new generation of students.
Over about 30 years he constructed a sprawling architectural fantasy like nothing in the world.