A vertical identity is one that, “is passed down through strands of DNA, [and] also through shared cultural norms.” (370) As a species, we are reliant upon the best of our DNA to be passed down in order to continue, “the march of our selfish genes.” (369) We trust genes that have made it all the way to reproduce. As a culture, we are reliant on vertical identities because they pass down ‘cultural norms’, which, like DNA, allows a society to function by passing down fundamental rules and ideas. This double-edged sword of biology and sociology forces us as humans to view vertical identities as superior. Solomon captures this by stating: “Vertical identities are usually respected as identities; horizontal ones are treated as flaws.” (371) A vertical identity is one that has proven itself successful and beneficial to society, a horizontal one can be likened to a mutation, an unproven ‘flaw’ that could damage society. In her paper Disability, Self Image, and Modern Political Theory, author Barbra Arneil claims that disabilities are often viewed as, “individual ‘incapacities’ occurring in the ‘ordinary course of nature’ that can be measured relative to the ‘degree of reason’ characteristic of the ‘freeman’.” (Arneil 222) Similar to how Solomon defines horizontal identities, Arneil says that a disability is viewed as a deviance to be ‘measured relative’ to a ‘freeman’, implying that, just as Solomon said, it is a ‘flaw’ in a person. Because these ‘incapacities’ hurt an individual’s chance to survive, it explains a society’s displeasure in horizontal identities and the want to suppress