[Oa] diagonal box roof mechanism?

[Jeff Gomes]

Hi everybody!

Could someone please be so kind as to describe what the "ingenious" roof mechanism is in the house shown on page 149 of "The Pop-Up Book" by Paul Jackson.  (I have not succeeded in contacting Mr. Jackson.)

For those who do not have the book handy, I scanned the photo and uploaded a low-res jpeg of it to <http://www.mmmagic.com/dl/om_ungers_pop-up_house.jpg>

The text accompanying the photo says:

"The basic Diagonal Box technique creates the simple shape of the house.  The separate roof, however, is created by an ingenious mechanism which swivels it into place and which is beautiful to watch as the card is opened."

Thanks!

-Jeff