Shadow Form

Cost: 50 points/-20 points
Shadow Form is an exotic physical Advantage that allows you to become a two-dimensional shadow.
==Versions==
* Can be turned off: 50 pointsBasic Set pg 83GURPS Powers pg 73-4
* Can't be turned off: -20 pointsBasic Set pg 153
==Special Enhancements==
*3-D Movement (+20%)
*Can Carry Objects (No encumbrance +10%; Light, +20%; Medium, +50%; Heavy, +100%)
*Light Insensitive (+20%)
==Special Limitations==
*Finite Thickness (-50%)
==Alternative==
*Injury Tolerance (Diffuse) with Infiltration enhancement
==Quotes by Kromm==
9 July 2024 at https://forums.sjgames.com/showpost.php?p=2531123&postcount=4
Shadow Form is massless. "You can defy gravity" is meant to be read as, "In F = GMm/r^2, m = 0 so F = 0." Physical attacks still affect you some not because they damage your matter but because they disrupt the surface you're on. And you cannot yourself take physical actions, which prevents even some weird two-dimensional definition of substance from mattering in any event.
It's too weird for a sensible physical definition anyway! You'd have to somehow assign an effective mass to the photons not impinging on a surface, which would be a perverse exercise, to say the least. It's more practical to say that "two-dimensional" means "infinitely thin," which means 0 volume and thus 0 mass at any finite density. You can theoretically have massive two-dimensional entities (point particles can have mass but zero dimension, after all), but good luck defining them with less than a lengthy mathematical physics paper, and then have fun with topological gravity . . .
So, "No, Shadow Form has no mass, and thus no weight" is the only answer that doesn't cause Fright Checks in real life. 
==Quotes by PK==
20 April 2007 http://forums.sjgames.com/showpost.php?p=389148&postcount=12
: the drawback to Shadow Form is that you only exist "on" other objects, so you can't stretch across a chasm on your own. You can't even step over a 1" gap in the street -- you have to either go around it or go down into the gap on one side and come back out on the other.
:Imagine that the Grand Canyon was only a foot across at one point (but still dozens of miles long and hundreds of yards deep). Crossing that 1' gap would take the average person a fraction of a second. The person in Shadow Form would have to head all the way down into the canyon to the base then back up again -- a trip that would take hours at a minimum. That's why non-switchable Shadow Form is a disadvantage.
==References==
Category:Advantages
Category:Disadvantages
Category:Exotic Traits
Category:Physical Traits
Category:Special Modifiers