Ladera Elementary Character Wall 2015 - Behind the Scenes Behind the scenes photos of Art Trek staff putting up Ladera Elementary Character Wall. Amazing job 5th Grade Class! Stay tuned for the finished product! the beginning Alissa mixing thinset. Thinset is like a glue, it is used to stick the tiles to the wall! learning how to put up the wall! The Ladera Elementary 2015 - 5th Grade Class Character Wall is up and ready to be grouted! Posted on June 5, 2015 by Cordelia Miller and tagged Character Wall Tile Wall 2015 Ladera Elementary.