I don't think a smart, aware person would walk on a waterproof tarp with 'corks', without being told. Nor a typewriter, nor a rope.
Weeded him out.
He's worked a logging landing for a few months, which is why he had 'corks'.
Not standing on tools that aren't ladders, scaffolding, etc, is sign of a brain at work.
I describe things by name, color, and location to new guys.
"Would you please get the yellow pole with the aluminum hook attached, and the 4' yellow extension pole?
Passenger side of the bed, on the loft."
That didn't work either.
I could have gotten out of the tree, held his hand, and walked him 50' to the truck, in clear sight.
I could ask for a blue and white rope from the truck bed, and have a groundie ask, "this?", And have a red and white rope in hand.
The majority of groundies are groundies for a reason, and it's not a good one.
Some groundies.
I wonder if there would be better attention paid if I said every time, "your ability to work here is based on your ability to follow direct instructions. Please go get the blue and white rope."
Clearly, this wouldn't work, as it would become adversarial.
Most people can't hear very well, unless they're trying to listen closely. Every walk of life.