An image of patterns. One set is composed of circles, the other is composed of diamond squares.

Source: :Manh z, Solkoll, Wikimedia

Ah, distinctly I remember it was in the bleak December;
And each separate dying ember wrought its ghost upon the floor.
Eagerly I wished the morrow; – vainly I had sought to borrow
From my book surcease of sorrowsorrow for the lost Lenore
For the rare and radiant maiden whom the angels name Lenore
Nameless here for evermore.

And the silken, sad, uncertain rustling of each purple curtain
Thrilled me, filled me with fantastic terrors never felt before;
So that now, to still the beating of my heart, I stood repeating
“’Tis some visitor entreating entrance at my chamber door
Some late visitor entreating entrance at my chamber door; –
This is it, and nothing more.”