When I play a video game, I want my choices and actions to have consequences beyond causing formerly hidden images to display and being able to move objects around on a screen. (kindlenationdaily.com)
You can even make use of objects around the arena to pull off some extreme super human moves. (plusxp.com)
Once past the newborn stage, 3 - 6 month old babies are developing depth perception as they reach, roll and generally become more able to interact with objects around them. (candokiddo.com)