How would you define 'existence'?
Is it a requisite for an entity to be able to interact with other entities to be considered as 'existent'?
What if there are real objects in the universe which cannot interact with other objects? If interaction does not occur, then we would be unable to detect the presence of such objects with our senses and technological instruments.
Is it a requisite for an entity to have the potential of being described to be considered 'existent'?
What if there are a class of objects (such as mental objects, ideas, mathematical objects, etc) that can be described and defined, even when they are not physical objects made from matter and which follow the laws of physics? After all, I can describe 'triangles' and 'unicorns', even when by scientific consensus we don't consider them as "real" objects.
Is 'existence' a phenomenom which necessarily point to a real event, or is it just a useful concept to differenciate between physical and non-physical objects?
Is the problem of defining 'existence' just a linguistic/conceptual problem, or does it have a metaphysical/ontological grounding (which might allow us to differenciate between existent and non-existent entities/phenomena)?
Thanks in advance for your time and patience!