The plural of block is bloxen. The singular of bloxen is bloxen.
This is an interlocking castle block. It's the fundamental defensive model for playing Seej.
No assembly required. Just print it and start playing Seej.
Rules for Seej can be found at http://www.s33j.net
This bloxen makes a great calibration object for your printer; it's simple enough to print reliably but also has some interesting geometry on the locking mortises underneath.
Bloxen are intended to fit together loosely so that your opponent has a sporting chance of knocking down your defenses.