Hence, as the line of sight to the upper part is the longer, it makes that part look as if it were leaning back. But when the members are inclined to the front, as described above, they will seem the beholder to be plumb and perpendicular. Vitruvius
You cannot save every fallen bird," said Woosley, leaning back against the wall and crossing his arms. "Even the handsome ones." "One will do," said Magnus, and, as Will was no longer within his sight, he let the front door fall shut. Cassandra Clare
we are for each other: then laugh, leaning back in my arms for life's not a paragraph and death i think is no parenthesis. E. E. Cummings