Crossword puzzle clue "this puzzle's special squares e g"

Party staple suggested by connecting this puzzle's special squares

Like the squares that comprise this puzzle's special letters

1866 debut, and a hint to the pattern created by the puzzle's special squares

This puzzle's special squares, e.g.

What's revealed by connecting the special squares in this puzzle in order

Psalm 100 excerpt suggested by six puzzle answers and graphically represented by certain black squares in this puzzle

Poet whose classic work is hidden in this puzzle (see the circled squares of the completed the puzzle)

The squares of "three squares"