Final answer:
Defining the reality and existence of an object delves into metaphysical and philosophical discussion. Philosophers like Kant, existentialists, and Aristotle have offered varied perspectives on the concept, questioning the nature of existence, forms, and matter in the context of what it means for something to be real.
Step-by-step explanation:
Determining the existence of an object beyond doubt involves a testing process using the senses, physical objects, and measuring devices. However, this method isn't infallible as not all things that are real can be detected physically. Philosophers have debated existence for centuries. For example, Kant's notion that existence is not a predicate suggests that we cannot think something into existence merely by considering it a property of that thing. Moreover, existentialists emphasize the certainty of our own existence and the awareness of it. Existence and reality are complex concepts that have been viewed differently by materialists, idealists, and existentialists alike. They challenge us to think about the ways in which reality can be multiple or singular, and the nature of matter in differentiating objects. Existence is thought to be greater when it is in the mind and outside the mind, referencing Anselm's argument on the topic.
The distinction between what is real and illusion or fantasy prompts us to consider if multiple realities can exist, or if there is one shared reality experienced subjectively. This metaphysical question can be approached by considering ideas such as Plato's forms or Aristotle's view on nature's abhorrence of a vacuum. These philosophical perspectives offer insights into the complexity of defining what it means to exist.