There may actually be a 4d spatial dimensions - infinite in size compared to our 3d spatial dimensions, so don't count them out. (and I assume this because our 3d spatial dimesions are infinite in size compared to 2d spatial dimensions - that is we cannot discover 2d flatlanders, because the flatland, having 0 depth in our dimension, takes up 0 volume)
I view time as an uncontrollable dimension of movement.
We have control over the other three, but time, we are constantly being forced forward. Maybe time is the 4th spatial dimension. If you take all of time that ever existed, it is infinite in size compared to our "now" point in time. By spatial movement, it's hard to describe, but you'd sort of be phasing in and out of different points in time, and as time changes, the space you occupy changes as well (with respect to time).
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