If you click on a small image, you will have the menu of the plotter with the equation of the surfaces already loaded. Which will allow you to plot a bigger image of the surface, while playing with the parameters (colors, viewing angles, zoom, spin, etc).
|x2+y2+z2+2x y z=1||Cubic with 4 singular points.|
|x4+y4+z4+5x y z=0||A quartic surface with 4 branches touching at the origine.|
|x3+y3+z3=(x+y+z)||a cubic surface with rotation.|
|x2 y2+y2 z2+z2 x2=(x2+y2+z2-0.75)||a quartic surface.|