While learning about SR, I encountered the famous Minkowski spacetime. At first I thought it was just a useful mathematical trick, with no particular physical meaning. But reading more about it, it seems that this notion of spacetime is often (always?) regarded as the actual physical reality. What makes one think spacetime is "real" ? Can we prove it ? By real I mean that the intuitive notion we have that space is one concept and time is another different concept is wrong. So that there would not exist such thing as time, nor there would exist space. Only one thing would exist, spacetime. Which our brains instinctively interprets wrongly as two different and separate things. Kind of like with eletricity and magnetism being the same thing in reality, but perceived like two different things by us.