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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>…</b>> <b>On Behalf Of </b>Will Steinberg via extropy-chat<br><b>Subject:</b> Re: [ExI] puzzle?<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>On Mon, Aug 1, 2022, 1:17 PM William Flynn Wallace via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:<o:p></o:p></p><p class=MsoNormal><span style='font-size:18.0pt;font-family:"Comic Sans MS";color:black'>>>…Ran across this: "A wavy brick wall takes fewer bricks than a straight one." Dunno if that is true. You? bill w<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>>…It doesn't really make sense in a vacuum, it's because a *freestanding* straight brick wall needs multiple layers while a wavy one can stand on its own with just a single layer. These days I think most people would imagine a brick wall as part of a house, so the topic in question is confusing in that conception<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>_______________________________________________<br><br><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Ja, what Will said.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Being a mechanical engineer, I was going to offer the example of corrugated aluminum (for roofing.) The corrugations allow a panel to be thinner and lighter than a non-corrugated sheet and still meet the strength requirement. So that would be the example offered by a prole (me) who is more comfortable with isotropic materials such as metals, rather than bricks which are highly anisotropic (bricks are hell-for strong in compression, not so much in bending moment stress.)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img border=0 width=303 height=218 style='width:3.1562in;height:2.2708in' id="Picture_x0020_1" src="cid:image003.jpg@01D8A59C.D8C1A440"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Knowing the principle of the wavy brick wall, this is a retaining wall I built in my back yard about 25 yrs ago. I hadn’t thought of it as a wave, but rather as an integral sign. The region to the left of the wall is soil about 2 ft higher than the sidewalk, grassy area on the right is a golden ratio ellipse, so the wall is an integral sign with the grass golden ellipse as the upper limit of integration.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We math geeks build stuff like this.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>spike<o:p></o:p></p></blockquote></div></div></body></html>