And if you need the how-to instructions, click on the building guide mode - top left, third button - and it will give you the option to watch the item being built or alternatively you can generate a step-by-step building guide which you can then print out.

BBC: Lego Factory

The lesson is that, if you do tread there, watch your step.

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Finally, "Step Lively" makes clear what happens if you don't watch the closing doors on the New York City subway.

NPR: Steve Wilson: A First-Call Saxophonist