For sure, we can imagine 1, or 2 dimensional space and we can say that we live in reality which can be divided in 3 space-dimensions. But are the dimensions real phenomena in our universe, or are they just our way to describe it? Can we separate our 3 space dimensions from each other to see that they really exists in a way that we see them in mathematics? For example, i havent ever heard physicists speaking about bending just X or Y or Z or time in separate, but only to bend them in one trough the gravity. Doesn't this sound like that there is really no such things as dimensions, but just a space that human brain wants to divide in pieces to have a better look on it? Do we have a good reason, a proof to think otherwise? That the dimensions REALLY exists, or is it just we?