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Answer by Schrödinger's cat for Tikz node without text
There is the key node contents that specifically allows you to drop the empty braces, {}. A minor pitfall is that this key needs to come after the name of the node....
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I have a lot of diagrams with shapes where I draw lines between certain points on the boundary of those shapes. With Tikz I can use nodes to draw shapes, and use anchors like "node.west" to draw lines...
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