Boys and girls pioneer builders.
A 1930 construction-toy manual published by the Wisconsin Toy Company for boys and girls, showing how to build models from notched wooden logs. The pictures are clean brown line drawings on a tan ground, showing a log-cabin-style toy truck with a cab and cargo bed, a tank-like armoured vehicle, a drawbridge with ramps, a tiered watchtower with a windmill-like blade, and a wagon with a catapult. A designer could take from them the stylised log-texture hatching and the simple blocky silhouettes of toy vehicles and towers.
