You can go for stationary centers of activities which look like walkers but don't have any wheels along with having rotating seats that can bounce and tip. (babywalkerpro.com)
Future versions will likely include other modes of transportation, such as public transportation, which would be expected to slow the appearance of new centers of activity. (scientificamerican.com)
Although this is a vast and spacious state, there are still centers of activity where people gather and commerce occurs. (medicalassistanttips.com)