You know a concept I really like in games? The Lens of Truth.

For those who never played Ocarina of Time or Major's Mask: The Lens of Truth was an artifact that let Link see "the truth"; that is, to see things that are not normally visible to the naked eye. It shows which walls, floors and objects are fake, and it allows the user to see things such as invisible ladders, platforms, enemies and ghosts.

Its pretty epic.

I like the idea of illusions in my games. It makes for a new aspect you could not explore in real life. I mean when was the last time you walked through a wall that wasn't there?

What if you had vision to see through things that didn't exist. Or see them differently altogether?

(There is no wall)

Another picture just because

Appart from merely the moving aspect of a game like using a lens of truth to find secret areas. What if you could find double meaning from everyday objects or signs like from the Movie: They Live.

Would look like this:

And just because this picture looks so cool:

But if you think about it this concept isn't so much different from that of Secret areas in Super Mario Bros.