In Canto Three of his poem John Shade (the poet in VN's novel Pale Fire, 1962) describes IPH (a lay Institute of Preparation for the Hereafter) and compares tips offered by the Institute to the amber spectacles for life's eclipse:
While snubbing gods, including the big G,
Iph borrowed some peripheral debris
From mystic visions; and it offered tips
(The amber spectacles for life's eclipse) -
How not to panic when you're made a ghost:
Sidle and slide, choose a smooth surd, and coast,