brick 2×3 = 16

A classic lego-like brick with knobs on every side.

Inspired by ffff.at Free Universal Construction Kit,
fffff.at/free-universal-construction-kit/

and the fact that Lego’s brick patent is over.
boingboing.net/2011/10/21/expired-patent-of-the-day-lego.html

Detailed dimensions and proportions of a classic Lego brick can be found here:
robertcailliau.eu/Lego/Dimensions/zMeasurements-en.xhtml

Bernat Cunidiy