Another one that doesn't work as a logo, I like the idea of visually communicating depth.
3D Isometric Shape Creator - Actions Photoshop
akatre: Aïe by Akatre,...
I cannot not mark this as a brilliant little piece. Lot's always to say for simplicity, but this is also a tricky combination of clever and understandable.
as the P fits into the x-height of the lower case K, a dimention is suggested, further supported by the shadows of depth