If you're interested in looking further into this approach, have a glance at a previous Gestalt coaching article: 'Just do it.' It describes a longer case study along with the theoretical principles that underpin it. Also have a look at Simon Stafford-Townsend's brilliant blog: 'Experimentation in Gestalt therapy'.
I would be very interested to hear from others who have used this type of experiemental approach in coaching, group facilitation etc. What was the issue, how did you approach it, what happened as a result? I look forward to hearing from you!