Wild!

#declare piggy=texture{pigment {rgb 1}
                        normal {
                                gradient x
                                slope_map {
                              [0    <1, 0>]
                              [0.45 <1, 0>]
                              [0.45 <1, -1>]
                              [0.46 <-0,-1>]
                              [0.46 <-0,0>]
                              [0.54 <-0,0>]
                              [0.54 <-0,1>]
                              [0.55 <1, 1>]
                              [0.55 <1,0>]
                              [1   <1,0>]
                                }
                                frequency 4
                                }
                        finish{ambient 0.25}
                        }

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