Another wonderful idea from Mitch Altman, designed and illustrated by Matthew Borgatti: Here is a 14-page download-and-print hackerspace passport you can carry on your travels to commemorate and advertise all the cool community workspaces you’ve visited. Each participating space can make their own “visa stamp,” and I’ve no doubt there will soon be a running, healthy competition among groups across the country to see who can develop the coolest stamp. Thermochromic holographic lenticular scratch-and-sniff passports, anyone?