Tim Vinke made this portable office, which he calls "Kruikantoor". It's carved out of EPS foam and has two chairs, a light, a desk, storage space, and an electrical hook-up. It has wheels so workers can move it wherever it's needed. At the link, you can see photos of how it disassembles.
Link via Geekologie | Photo: Design Boom | Previously: Pop-Up Cardboard Office