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Just imagine that your kids need some help, to prepare fishes for April 1st, likeHer: "please, Daddy, help us to draw some fishes"Me: "Sure, Daddy is a champion, actually, I do that everyday at work: drawing fishes - and more generally nice stuff - is exactly Daddy's job".OK, no need to talk neither about Talbot's curves, ellipse negative pedal curvenor Burleigh's ovals, unless you don't want to scare them, e.g.t=seq(0,2*pi,length=100) b=.8c=sqrt(1-b^2)x=cos(t)-c*sin(t)^2y=(1-2*c^2+c*cos(t))*sin(t)/bplot(x,y)From now on, it is rather simple to draw fishes,t=seq(0,2*pi,length=100)y=cos(t)-sin(t)^2/sqrt(2)x=cos(t)*sin(t)plot(x,y,type="l",axes=FALSE,xlab="",ylab="")polygon(c(-2,-2,2,2),c(-2,2,2,-2),col="light blue",border=NA)polygon(x,y,col="red",border=NA)axis(1)axis(2)lines(x,y,type="l")so we can easily get nice fishes,