Switching lights randomly//Simulate home presence//Home security

How can I easily simulate that somebody is home? I want to switch on different lights randomly and for a random minimum time period during the night.
The Homey Athom blog is referring to ‘home presence simulation’, but there is no explanation how to do this.

You can create a flow that is triggered lest say every 10 minutes.
And then only at night and continue with a chance of 20% and then turn on the lights.
The chance you can do with a logic element in the flow.

Is this really chance or should this be Change? How does that work? In the Dutch language it looks like this:

Yep. That’s what’s making it random.