plot3d(`*`(`^`(`*`(x, `*`(y)), `/`(1, 3))), x = -.1 .. .1, y = -.2 .. .2, color = x, axes = normal) 

Plot
 

 

plot3d(`+`(`*`(`/`(1, 3), `*`(y, `*`(`^`(`*`(x, `*`(y)), `*`(-2, `/`(1, 3))))))), x = -1.5 .. 1.5, y = -2 .. 2, color = x, axes = normal) 

Plot
 

 

 

 

 

plot3d(`+`(`*`(`/`(1, 3), `*`(y, `*`(`^`(`*`(x, `*`(y)), `*`(-2, `/`(1, 3))))))), x = -.15 .. .15, y = -.1 .. .1, color = x, axes = normal) 

Plot