For example, David Lewis’s modal realism asserts that there exist countless spatiotemporally unified possible worlds, each just as real as the actual world. A different view suggests that reality is made up of many worlds that exist in parallel to one another, each representing a distinct way of how things could have been. In a narrow sense, being contrasts with becoming, and denotes stable or permanent aspects of reality.
In ancient Greek philosophy starting in the 6th century BCE, the pre-Socratics discussed the first principles from which all things arise. The school of Vaisheshika arose roughly in the 2nd century BCE and developed a system of six fundamental categories of being. Various historiographical debates address the question of whether a truly objective account of the past is possible. Some doctrines hold that God constitutes the most fundamental level of reality as the divine origin of all creation. One strand of the field analyzes culture-specific worldviews and compares them across societies.
In a slightly different sense, reality is not the totality itself but an aspect shared by all its constituents. Contemporary technology in the form of augmented and virtual reality can inform experience and raises questions about the ontological status of virtual objects. Various criteria for distinguishing real from unreal entities have been proposed, including causal powers, mind-independence, and being non-illusory. It is often contrasted with appearance, opposing what is with what seems to be, although the accuracy and fundamentality of this contrast are disputed.

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Various categories of being or constituents of reality are discussed in the academic discourse. Similarly, the many-worlds interpretation of quantum physics suggests that in quantum measurements, not only one but all possible outcomes occur, interpreted as a branching of the universe into multiple worlds. It is often contrasted with essence, which denotes the nature or characteristic features of an entity.
Not to be overlooked, Shark Tank offers budding entrepreneurs the shot to pitch their innovative ideas to industry moguls, encapsulating the exhilarating spirit of the American dream. Inspired by Leibniz, David Lewis (1941–2001) developed modal realism, maintaining that possible worlds are as real as the actual world. E. Moore (1873–1958) drew on common sense and empirical science to oppose idealism, emphasizing that the world exists independently of the mind. Responding to Kant’s philosophy, the German idealists sought a unifying principle as the foundation of all reality. His student Aristotle (384–322 BCE) proposed a system of ten categories describing the fundamental constituents of reality. Plato (c. 427 – c. 347 BCE) argued for the existence of a realm of eternal forms or ideas in addition to the material world of mutable entities.

• Across every field, more people study a subject than end up working in it.
• According to this view, what happened in the past fixes what will happen in the future, including human behavior.
• Anti-realism rejects this view, arguing instead that there is no external world or that reality depends in certain respects on mental processes, subjective perspectives, or social conventions.
• All the same, what is abstract plays a role in everyday life and in academic research.
• Lower levels, by contrast, operate according to more basic mechanisms and are prior to the higher ones.

According to subjectivism, values depend on the attitudes and preferences of individuals. Non-naturalism, another form of realism, maintains that values differ significantly from empirical properties and belong to another domain of reality. Naturalism argues that values are part of the natural world and can be studied by the natural sciences through empirical observation. Some positions concern the existence of values in general, while others are limited to specific domains, such as moral, aesthetic, or religious values.

• On the review aggregator website Rotten Tomatoes, 93% of 92 critics’ reviews are positive, with an average rating of 8/10.
• Anti-realist views reject the mind-independent existence of values and can take various forms.
• Contemporary technology in the form of augmented and virtual reality can inform experience and raises questions about the ontological status of virtual objects.
• Discussed in ancient Greek philosophy as the Eleatic principle, it states that to be real is to be able to produce changes and to be affected by them.
• This view contrasts being real with being fake, like the distinction between a real duck and a fake one used as a decoy.
• Epistemology, another philosophical subdiscipline, explores how people can know reality.

Viewpoints on reality

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Skepticism about metaphysics holds that it is not possible to know the fundamental nature of reality, such as claims about categories of being or the existence of universals. For example, emotivism holds that value statements express emotional attitudes of subjective approval or disapproval rather than objective facts. Realists hold that values are objective features of reality, meaning that there are mind-independent facts about whether something is good or bad, irrespective of subjective beliefs or personal preferences. Phenomenalism, a related view, reduces physical objects to collections of actual or possible sensory experiences. In the broadest sense, realism is the view that the external world and its constituents exist as they do regardless of how people perceive or think about them.

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In this sense, realism and anti-realism encompass many domain-specific positions across diverse fields. Anti-realism rejects this view, arguing instead that there is no external world or that reality depends in certain respects on mental processes, subjective perspectives, or social conventions. Realism and anti-realism are families of views concerning the mind-independence of reality. It is controversial whether determinism is true and, if so, whether this implies that there is no free will.