Left screenshot is from Yellowbridge; right from Richard Sears (Uncle Hanzi).
I circled in green the lone pictogram that most obviously pictures a hand holding a carpenter's square.
For productivity, I colored in red a semicircle in merely 3 of the pictograms, but this semicircle figures in the other pictogram. Are these semicircles intended to symbolize the human hand?
I still can't picture how these pictograms evolved to 巨.