Scott Russell Sanders:
There is a mystical virtue in right angles. There is an unspoken morality in seeking the level and the plumb. A house will stand, a table will bear weight, the sides of a box will hold together only if the joints are square and the members upright.
When the bubble is lined up between two marks etched in the glass tube of the level, you have aligned yourself with the forces that hold the universe together.

- The Paradise of Bombs