The ground (earth if your Irish like me) is a protective conductor,in the event of a exposed conductive part of anything comes in contact with a current carrying conductor the earth dissipates the current to ground by a path of least resistance,ie a person would be harder to get through than a copper cable
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The ground is generally considered a good conductor rather than an insulator. It can conduct electricity and can help to dissipate excess charge.
If you touch an insulator with a conductor carrying electricity, there will be no electrical flow between them because the insulator does not conduct electricity. However, it's important to note that touching the conductor can still be dangerous as you may provide a pathway for the electricity to flow through your body to ground.
Glass is an insulator. That's why it's used to hold powerline conductors to the cross-bars of power poles. No current leaks to ground because the glass does not conduct electron flow (current).
A ruler is typically made of plastic, which is an insulator. This means it does not conduct electricity well.
Velcro is an insulator, meaning it does not conduct electricity. It is made up of nylon or polyester fibers which do not allow electricity to flow through them.
A magic one is an insulator.