Some fun with POV-Ray.

a Seifert surface
Just for fun the equation (slightly rounded) is $x^8 + 4x^6y^2 + 4x^6z^2 + 6x^4y^4 + 12x^4y^2z^2 + 6x^4z^4 + 4x^2y^6 + 12x^2y^4z^2 + 12x^2y^2z^4 + 4x^2z^6 + y^8 + 4y^6z^2 + 6y^4z^4 + 4y^2z^6 + z^8 - 3.28x^6z - 9.83x^4y^2z - 9.83x^4z^3 - 9.83x^2y^4z - 19.67x^2y^2z^3 - 9.83x^2z^5 - 3.28y^6z - 9.83y^4z^3 - 9.83y^2z^5 - 3.28z^7 - 2.0x^6 - 6.0x^4y^2 - 18.0x^4z^2 - 6x^2y^4 - 36x^2y^2z^2 - 30x^2z^4 - 2y^6 - 18y^4z^2 - 30y^2z^4 - 14z^6 + 3.28x^4z + 6.56x^2y^2z + 10.93x^2z^3 + 3.28y^4z + 10.93y^2z^3 + 7.65z^5 - 8.74x^4 + 64x^3y + 52.45x^2y^2 - 64xy^3 - 8.74y^4 + 3.28x^2z + 3.28y^2z + 7.65z^3 + 2x^2 + 2y^2 + 14z^2 - 3.28z - 1=0 $ under the constraint $ 6x^6z + 18x^4y^2z + 18x^4z^3 + 18x^2y^4z + 36x^2y^2z^3 + 18x^2z^5 + 6y^6z + 18y^4z^3 + 18y^2z^5 + 6z^7 - 6x^4z - 12x^2y^2z - 20x^2z^3 - 6y^4z - 20y^2z^3 - 14z^5 + 16x^4 - 96x^2y^2 + 16y^4 - 6x^2z - 6y^2z - 14z^3 + 6z \geq 0 $.