I like think of it this way. Think of a point representing 0D object. Now draw a 1D line. You can fit an infinite amount of 0D points on a 1D line no matter how short you make that line. Now draw a 2D surface. No matter how small that surface you drew, you could fit a 1D line of any length by folding it into that surface. Now imagine a 3D object. Every 2D surface can be folded into that 3D object. Now imagine a 4D object – no matter how small you think that object is, it can hold everything in this universe within it.
This is what makes it hard for me, anyway, to imagine.
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