In this design downwards application of a marble at the square cardboard section lifts the counterweight (the wheels at left). However, the sloped cardboard [Top Right] remains reverse-sloped, allowing the marble to sneak back towards the beginning of the square cardboard [Middle]. This process is aided along the backward motion by a fixed and slightly upward-inclined half-track or supporting member [not pictured, but it would occupy the approximate slot shown in the curved cardboard] which acts simultaneous with the curved cardboard.
Thus, the process follows the following procession of 'inclinations':
1. Downwards pressure from marble. Cardboard does not resist.
2. Reverse slope of cardboard (cardboard does not move).
3. Marble gains lift from counterweighted cardboard as it is supported by a fixed mostly horizontal member.
4. Marble returns to beginning of cardboard.
5. Cycle continues [hypothetically].
Structural weaknesses in my design make it difficult to implement in this specific construction. But it is close.
My Book On The Subject Of Perpetual Motion Machines May Be Found At HERE: http://www.amazon.com/Nathan-Coppedges-Perpetual-Machine-Designs/dp/1495373835/
An Autobiography of "The Inventor" can be found HERE: http://www.amazon.com/Autobiography-Inventor-Perpetual-Motion-Over-Unity/dp/1508631638/
A relatively cheap bound volume of both the full designs and the autobiography may be found HERE (one continuous text): http://www.amazon.com/Designs-Theory-Autobiography-Inventor-Perpetual/dp/1508729085/ good deal, because it's less than a dollar less cheap than the designs alone.