May I pass "Martin's Marbles" pix on to Philippe at block@arch.ethz.ch ? Do you have a reference to the eponymous "Martin" ? At 07:30 PM 6/9/2016, Bill Gosper wrote:

I'm surprised they didn't use Martin's Marbles technology gosper.org/dodex.gif gosper.org/martinsmarbles.png which is indifferent to the sign of g. --rwg On 2016-06-08 16:02, Henry Baker wrote:

...

(Watch the 4.5 minute vimeo video using the link below to see the structure being built.)

Look ma, no mortar!

Dr. Philippe Block (no kidding!!) is from MIT.

http://www.wired.com/2016/06/compression-keeps-24-tons-stone-collapsing/

https://player.vimeo.com/video/167868985