No paragraph indentation everywhere, except for specific paragraphs

Question

By default, I prefer to have no paragraph indentation (which I have implemented by putting \setlength\parindent{0pt} in the preamble of my document), but for my current document I would like to be able to return to the standard paragraph indentation (i.e. what I would get if I hadn't put that command in my preamble) for certain paragraphs. I tried putting \indent in front of the paragraphs I wanted to affect, but it didn't work (presumably because the command \indent uses the value of \parindent). The only way I can think of to do what I want would be to leave the default \parindent alone, and put \noindent almost everywhere, but that would be kind of a pain. Is there any better way to do this?

This answer seems to imply that it might be necessary to write my own document class in order to accomplish this. Is that really true?

Answer 1

Why don’t you renew the definition of \indent?

\documentclass[11pt,a4paper]{scrartcl}
\setlength{\parindent}{0pt}
\setlength{\parsep}{1\baselineskip}
\renewcommand{\indent}{\hspace*{10.95003pt}\ignorespaces}
\begin{document}
\verb+\parindent+ = \the\parindent

These are some paragraphs

\indent and this is on is not indendet

as you can see here \dots
\end{document}