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+import trembling;
+settings.outformat="pdf";
+size(6cm,0);
+
+real R=1/5;
+real h=0.5;
+real d=1/12;
+real l=.7;
+
+pair pA=(-l,0);
+pair pB=(l,0);
+
+tremble tr=tremble(angle=10,frequency=0.1,random=50,fuzz=1);
+path waterline=tr.deform(pA..pB);
+
+path disk=shift(0,-d)*scale(R)*unitcircle;
+path water=waterline--(l,-h)--(-l,-h)--(-l,0)--cycle;
+path container=(l,1/7)--(l,-h)--(-l,-h)--(-l,1/7);
+
+filldraw(disk,red,linewidth(.3));
+fill(water,mediumgrey+opacity(0.5));
+draw(waterline);
+
+draw(container,linewidth(1.5));
+
+shipout(bbox(2mm));