Here's a little teaser of a current project that I've been working on.
If you take a delta robot and replace the parallel linkages with the a pair of parallel wires wound over motor pulleys then you get a robot that can scale up to giant size. Like the size of a giant room. Yeah, it gets big. I've got it as big as a triangle 20m×19m×12m and 5m high so far, but it could go bigger!
Live Motor Control
Safe to use around people
Build tall towers
To whet your appetite for giant indoor cranes; here's a couple of videos of the crane as it was set up at the OGGCamp 13 Open Hardware Jam:<!-- more -->