the importance of rock walls?

[EnigmaEcho]

wow, i have so many questions! sorry about that
anyway, i see many people doing rock walls for thier geckos- my gecko certainly loves to climb, so my questions:
what is recomended material and prep
how can i insure that my gecko does not fall and get injured?
thanks

 

[im faster]

there are tons of build threads.. on what people use and how they do it..