Of the several boons granted by a mark of possibility, the power to reset is perhaps the most coveted.
Put simply, the combination of increased potential and power granted by a mark, along with the loose structure of the abstract world, allows one to reshape their form.
Most commonly this is used to overcome physical limitations experienced in the "real" world. Loss of limb, genetic disease, and other debilitation can all be altered. Not everyone desires this, however.
Also fairly common is the alteration of appearance. The abstract world is a place of near total acceptance and those that reside there experience the urge to appear as they feel. These physical changes can be as simple as a different hair color or as profound as complete erasure of previous appearance.
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Upon entering the abstract world for the first time, newly activated marked beings are encouraged to spend time alone and acclimate. This includes the opportunity reset and instruction on how to do so.
The ability to reset is not limited to a single use, though subsequent resets can become more difficult after the first.
Being comfortable in ones body is an important aspect of being marked and not something that any marked person will scoff at.