Roman's Bent Circle:

This space curve was produced using the following Maple commands:

> f:=[sin(t),cos(t),cos(t)*sin(t)];

                 f := [sin(t), cos(t), cos(t) sin(t)]

> with(plots):
> spacecurve(f,t=0..2*Pi,axes='FRAMED',
>   orientation=[-10,70],thickness=2);