Sign
Sings are objects that appear in both the Classic Trilogy and the Wonderland Adventures-trilogy.
Classic Trilogy
Sings can be read simply by stepping onto them. Sometimes the text on the sing is a hint for the level or explain a puzzle, while other times it just adds to the level's atmosphere.
Wonderland Adventures-trilogy
In the Wonderland Adventures trilogy, sings behave somewhat differently. They now look like actual sings instead of just pieces of paper on the ground. They are now read by clicking on them instead.