are chairs real?Watch
is it a collection of particles assigned a name to by the mind that can be changed at any time or is it an actual object?
Because the universe is so complex, to get by we have to simplify phenomena according to common patterns. We have a mental model of "chairness", which we use to label things that match that mental model, but it's only a convenient interpretation of reality based on assumptions about an object's intended use case, etc.
The idea that there are "objects" at all is also a convention, since there is no physically defined boundary between one thing and the next, it's a convention for purposes of categorisation and making sense of the world around us.
All energy is in a constant state of flux, constantly transforming into different forms of energy, over and over and over. We choose to name forms of energy for convenience, but your chair is in essence no different to any other object. The whole universe is essentially one giant Lego set made of universal tiny little bricks. You can build anything out of the bricks, a chair, a table, a car, a planet, anything. It's all the same stuff. Even we humans are the same stuff. The universe has one constant which is that nothing in it is constant. Everything is constantly decaying, unravelling, losing it's shape and form and being transformed into something else.
Just as with a Lego set, if you build a castle with it and then want to build a fire engine, then you must first dismantle the castle back down to it's individual universal bricks and then assemble them into something else. This is a key principle and there is much wisdom to be found in it.
In the Bible Jesus iterates this universal principle in his parable:
Jesus replied, “Verily, verily, I say unto you, except a corn of wheat fall into the ground and die, it abideth alone: but if it die, it bringeth forth much fruit."
This is the same principle. Something must first decompose, be reduced back to its "prima materia" before it can be formed into something else. The philosophers and alchemists knew this well.
Many things follow from this simple wisdom
1. Everything you see has been here in the universe for all time, but in many different forms
2. Nothing ever "dies". It just gets reduced to prima materia and reassembled into something else, including us