I noticed today, that DD1 doesn't often (ever?) cross over her body with her arms.
Today she said "High Five" to the SALT, and raised her right hand in the air. But when the SALT (who was on DD1's left side opposite her) raised her right hand, DD1 stopped mid-air, raised her left hand instead, and 'high-fived' the SALT, so that they were 'high-fiving' straight on rather than diagonally.
The SALT said "oh, I thought DD1 was going to use the other hand..." and it made me think back to reading something on here about crossing the body.
What was it, and does it matter?