It may sound a bit off field, but try this. Take a measuring tape and start measuring things, a sit, a box, a roll of toilet parer, your car, your desk, your arm, a tree... whatever is there. Measure all three dimensions if possible or at least two. Of course you won't remember all these measurements, but some you will; you can always measure things again and again... do a couple a day, it helped me to become quite good imagining things in space...
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