SHOW & TELL
'The name of <a href="http://www.j-archive.com/media/2011-05-04_J_05.jpg" target="_blank">this</a> wedge-shaped <a href="http://www.j-archive.com/media/2011-05-04_J_05a.jpg" target="_blank">piece</a> in an arch signifies its place of importance'
keystone