Need volunteers for a research on mental maps (Madrid)

Hello! I am an Anthropology Major, doing research on Expats and mind maps for my thesis.
I am looking for volunteers to do a short "experiment", which can be both fun and insightful, and will just take 10 minutes of your time and a sheet of paper. We can do it in person, in a place such as a cafe, and hopefully you will want to stay 20 more minutes for a followup interview.
Alternatively, you can just participate in the experiment from your own place, and send me the results by email.
If you are interested, you can respond to me here, or send me a personal message, and we can work out the most convenient time and place for you.

Thank you very much, and enjoy your time in Spain!