When LEGO introduced click hinges, they also introduced this slightly unorthodox technique. You can click any piece that has bars (essentially all 1xN bricks) on to them, resulting in this fun arrangement.
Fun fact: the name of the technique was coined by Jon Palmer after its inventor, Gary McIntire. He liked it so much that he started calling himself Mr GSnot for a while. Catchy, right?
To find the different pieces needed for this technique you can search LEGO's online Pick-a-Brick for the design ID's. We link other market places directly on each individual piece page, which you can find below.
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