Modulex

Godtfred Kirk Christiansen, son of the company founder, decided to make a standalone product for architects called Modulex. The bricks had different ratios than regular Lego bricks, allowing more accurate scale models of real world buildings, but they were completely incompatible with regular bricks. Pictured here are the 3 Modulex figures, which if you look closely you can see they are glued together! Lego even sold the adhesive. There is so little information on these figs that I can't even tell you which set they came in. They have entries in the bricklink database but that's about it.