Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
In Canto One of his poem John Shade (the poet in VN’s novel Pale Fire, 1962) describes his house and mentions the stiff vane so often visited by the naïve, the gauzy mockingbird:
The house itself is much the same. One wing
We've had revamped. There's a solarium. There's
A picture window flanked with fancy chairs.
TV's huge paperclip now shines instead