Plato believed that true beauty exists in the realm of Forms, which is a realm of perfect and eternal ideas. The physical world is merely a reflection of these perfect Forms, and it is through contemplating these Forms that we can experience true beauty.

Aristotle believed that beauty is an objective quality that exists in objects themselves, and that it is primarily characterized by symmetry and harmony. He argued that these qualities are pleasing to the senses and that they evoke a sense of pleasure and satisfaction in the viewer.

Kant argued that beauty is both subjective and objective. He believed that there are certain objective qualities that make an object beautiful, such as symmetry and harmony, but that our experience of beauty is also influenced by our subjective preferences and associations.

Hedonism is a philosophical theory that states that happiness is the ultimate goal of human life and that it is achieved through the pursuit of pleasure and the avoidance of pain.

Epicurus believed that happiness is not a state of perfect pleasure, but rather a state of balance between pleasure and pain. He argued that the pursuit of excessive pleasure can lead to suffering, and that true happiness lies in finding a balance between pleasure and pain.

Mill believed that happiness is the greatest good for the greatest number. He argued that the goal of society should be to maximize the happiness of all its members, and that this can be achieved through the pursuit of justice, equality, and liberty.

Most theories about the relationship between beauty and happiness posit that they are either positively correlated, negatively correlated, or independent of each other. The idea that beauty and happiness are mutually exclusive is not a common theory.

Research has shown that exposure to beautiful environments can have a number of positive effects on our mental and emotional well-being, including increasing feelings of happiness and well-being, decreasing feelings of stress and anxiety, and improving cognitive function.

While beauty can be associated with social status and wealth, this is not a direct explanation for the link between beauty and happiness. The other options provide more direct explanations for how beauty can influence our emotional state.

Research suggests that the relationship between beauty and happiness is a complex one that is influenced by both universal and culturally specific factors. While there are certain qualities that are universally considered beautiful, our individual preferences and cultural values also play a role in shaping our perception of beauty.

Experiencing beauty is generally associated with positive benefits for our mental and emotional well-being. Increased risk of depression is not a potential benefit of experiencing beauty.

Subjective well-being is a broad term that encompasses the individual's overall assessment of their life satisfaction, their experience of positive and negative emotions, and their sense of purpose and meaning in life.

While the difficulty in defining and measuring beauty, the influence of cultural and individual differences, and the ethical implications of manipulating beauty are all potential challenges in studying the relationship between beauty and happiness, the lack of objective measures of happiness is not a challenge, as there are various subjective and objective measures of happiness that can be used in research.

Aesthetic awe is a specific emotional response to beauty that involves feelings of wonder, reverence, and transcendence.

Creating more green spaces, designing aesthetically pleasing buildings and public spaces, and promoting the use of art and culture are all potential implications of the relationship between beauty and happiness for urban planning and design. Prioritizing economic development over aesthetic considerations is not a potential implication, as it would undermine the goal of creating beautiful and livable urban environments.