# How to plot solids of revolution

Hi,

Is it possible to plot the solid generated by revolving a curve about a line?

For example, I want to see what kind of solid is generated from this question:

Use shells to find the solid generated from the region in the 1st quadrant bounded by $y=x$ and $y=x^2$, revolved about $x=-1$.

The volume of the solid is $\frac{\pi}{2}$. How can I view this solid? I checked the sage calculus tutorial for clues but couldn't find any.