There are projects attempt to enhance the relationships in family, especially, kids and other members. As far as I know a few software are trying to achieve this goal. Some others make use of objects in our daily-use, for example, table.
Several days ago I saw this picture with the title of "A playground under the table", and felt it is indeed a thoughtful idea for kids.
After a while I read it and found it is not just a simple table with toys underneath, but there is a link between the two sides. The movement of adults that happens on the table top will cause certain activities under the table. It is called Plable, By Yumiko Tanaka.
From technique perspective, it is more interactive than my first expression; however, for some reason, I feel the children play a passive role under the table.
Here is another table project that shares the similar idea, called So You Think It's A Table by Sonal Patel.
Components
The Top - For socialising and entertaining as a family or for grown ups or for adults and children to mix by drawing on the slate hot mats .
Periscope - When the child is underneath they can spy on the world above by looking through the Periscope.
Holes - Pop off the slate hot mats and you have your own stage to put on a performance or you could use them to interact with the world above.
Peep Holes - When closed in underneath, in your underground bunker, you can slide down the panels and peep out of the little viewing holes.
Posting Holes & Letter Box - When the children are underneath, parents or anyone playing can post letters from the outside .
Secret Shelf - Hide your valuables under the secret shelf in the hollow leg. For small hands only .
Curtains - Create your own enclosure by hanging your blankets on the four curtain poles around the table.
Drop Down Black Board - The double sided black board can be dropped down in play mode or clipped back up underneath the table when socialising.
This one seems like a toy for both adults and children. The cups under the table really remind me a lot about the childhood time.