I absolutely loved Construx growing up. I also had the motor box for it and distinctly remember my father explaining how gear ratios can increase torque by trad

I absolutely loved Construx growing up. I also had the motor box for it and distinctly remember my father explaining how gear ratios can increase torque by trading off turning speed using the rubber o-rings and yellow pulleys. One advantage Contstrux had over Lego is that once assembled, they were pretty rigid and sturdy toys. A great creative toy for kids.