Structural descriptions affect imaging tasks
Hinton shows that perception of a shape depends on the structural description used to construct it. The example that Hinton cites in support of this is described in the expanded text.
Imagine 2 triangles. Take one, flip it over and superimpose it on the first.
Imagine two parallelograms drawn together and superimposed.
The verbal descriptions produce shapes that are percevied to be different, but are in fact identical.
Geoffrey Hinton, 1979b.