It's not an important question, but I want to know why
I don't know much thing about 'empty' object. And I found that you used properties panel instead hotkey 'S' to size the empty.
When I sized my empty with hotkey 'S', realized the size value in Empty data panel doesn't change.
What are the differences between these?
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Jonathan Williamson (jonathanwilliamson)
The size property is the actual size of the empty in global space. Using the Scale tool is like applying a modifier.
For example, if you have an empty with a size of 1.0 and then scale it 0.5 the actual size has not changed, but the display size has been multiple by 0.5.