Expected output (2nd line has 5mm more indent than 1st, 3rd and following lines have 5mm more indent than 2nd):
\documentclass{article} \begin{document} \setlength{\parindent}{0pt} \parshape=3 5mm 40mm 10mm 35mm 15mm 30mm This is sentence 1. This is sentence 2. This is sentence 3. This is sentence 4. This is sentence 5. \end{document} 
Bad output (tikz):
\documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} \path node[draw,text width=50mm] { \setlength{\parindent}{0pt} \parshape=3 5mm 40mm 10mm 35mm 15mm 30mm This is sentence 1. This is sentence 2. This is sentence 3. This is sentence 4. This is sentence 5. }; \end{tikzpicture} \end{document} 
