#TBT Constructive Play, c. 1917 - Playscapes
Mazzy Bell

"The value of constructive play as a factor of development is an unworked educational mine" Edgar James Swift, 1917 In Manual training - Play problems; constructive work for boys and girls based on the play interest, William S. Marten extols the virtues of constructive play (basically building stuff from tops to 'roller coasters').