On Mon, 02 Sep 2013 17:18:48 -0700, Oren wrote:

By Natalie Rodriguez, This Old House online

"TOH helps you identify all those architectural "thingamajigs" and
"whadya-call-its" you find around the house"

http://www.thisoldhouse.com/toh/photos/0,,20425634,00.html

Picture click through 21 of them.

Picture No. 13 shows the "Kite Winder," the middle of a set of three
wedge-shaped stair steps, or winders, that together make a 90-degree
turn.

Why are there four wedge shaped steps in the picture, not just three?