Nintendo actually made rounded Lego-style blocks in 1968-72 called N&B Block http://blog.beforemario.com/2011/10/nintendo-n-block-introduction-1968-71.html htt

Nintendo actually made rounded Lego-style blocks in 1968-72 called N&B Block http://blog.beforemario.com/2011/10/nintendo-n-block-introduction-1968-71.html http://blog.beforemario.com/2011/10/nintendo-n-block-introdu...