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  1. The units are incorrect for this graphic. There are no units listed for happiness. Mass should not be expressed as an exponential. Capital M in the SI system for units is mega and should only be used as a prefix for a base unit. What the artist is probably going for is Area which could be expressed as (m^2). Although it could be made by expressing it as mass as noted previously it should be expressed as (kg) in SI units and depending on the supplies used could make the slope non-linear.

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