I've (possibly temporarily) restarted an even geekier hobby that I used to do. Model railways........
Space has been a restricting factor for me in the last few years so I had to have a small layout. As small as possible. After some googling and an exhaustive amount of reading the scant amount on the net about this scale I settled on T Gauge. The T stands for 3. 3 mm gauge. That is the space between the rails of the track. Its bloody small! The actual scale is 1:450, so 1 metre on the layout is almost half a kilometre in real life.
To put it into perspective, here's a train next to a space marine and a genestealer:
Just in case you don't think a train that small can work here's a (boring) video. Not only does it work it even has directional lighting!
Anyhoo. I'll probably be quite quiet on this blog for a while as I work on my toy train set. I have made a blog for that too as there certainly aren't enough T Gauge blogs at the moment. Its at http://tinyt-gaugetrains.blogspot.co.uk/