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I've been working on some spacecraft design ideas recently and I hit a wall. Just couldn't think of anything interesting to put on paper. Then I had an idea. I used to sit down with the kids once in a while and build little spaceships out of Lego. So I got out the big tubs of lego we have and started playing around with different configurations. It was a huge help! If you have a bunch of lego I suggest using them when you need a little help designing interesting objects.