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Apologies this is late: should have arrived yesterday, but I was running a workshop that went on twice as long as it should have (in a good way).
By way of slight compensation, here's a little drawing game that I used yesterday to get people warmed up.
Ask people to draw a coffee cup that meets their need right now. Give an example (mine was 'a coffee cup you could print workshop notes on and read surreptiously'). Give people three minutes to do it, and then ask everyone to show everyuone else what they've designed.
It helps do two things. Firstly, it gets people drawing on the Artefact Cards, which might have been the first time they've drawn anything in a while. Secondly, it makes people comfortable in holding up something they've drawn and talking about it. What's important is, of course, what they say, rather than what they're drawn.