Diversity Theory is very similar to Spectrum Theory however it adds multiple “dimensions” (attributes) to the characterization of Objects instead of just looking at a single dimensional spectrum. For example, height has a spectrum, however height isn’t the only attribute of human physical characteristics.
Height, Skin Color, Hair, Eyes, Body Composition, Metabolism, Immune System, Bone density, Neurological conditions, and so on, there are an incredibly high amount of characteristics of human beings.
Diversity Theory states that Human Beings are very diverse in their characteristics. You can have short people with dark skin, short people with medium skin, short people with light skin, tall people with dark skin, tall people with medium skin, tall people with light skin, medium height people with dark skin, medium height people with medium skin, and medium height people with light skin, and so on. The general point is that people are very diverse because of the amount of characterizations. You can have a short person (1) with light skin (2) with small lungs (3) but thick bones (4) and bad metabolism (5) but good immune system (6) with blonde hair (7) and brown eyes (8) with some vision problems (9) and naturally good sleep (10) with large feet for their height (11) and a high tolerance for temperature (12) but low tolerance for spicy food (13) and average intellectual aptitude (14) and the list can continue.
When you combine Spectrum Theory and Diversity Theory you realize that human beings are Complex Object (Objects with a lot of attributes that may or may not have their own spectrum). Complex Objects are daunting but they are not impossible to analyze.
In Conclusion, Diversity Theory explains that human beings are very diverse and that it is important to keep in mind that this diversity exists so that one is able to properly analyze human nature.