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Ribbon
on 19 Oct 2021
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[x,y]=meshgrid(-20:.02:20);
s=@(p,q)sin(((x-p).^2+(y-q).^2).^0.5)*4;
mesh(x,y,s(-3,-3)+s(3,-3)-s(1,1)-s(-1,1)+s(0,0))
colormap(gca,'hsv')
view(37,28)
axis equal off