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Get 3 sticks, try and arrange them all perpendicular to each other. You can do it. Now try with 4, you can't. We live in 3D space.
Time is a line, at least as we experience it. Just one, it's hard to even figure out what 2D time would mean, although physicists have thought about it.
So, 3+1=4. It turns out they're kind of interchangeable, though, in that swapping time for a kind of angle made up of some space and some time, if done in a certain way, leaves the predictions of physics the same. That's special relativity, and it is itself connected to the way everything is a wave.
Huh?
I can align as many sticks parallel to each other as I want.
Shit. Fixed.