Hi,Jonathan, thanks for the tips and suggestions! Looks like I cannot search for a while and I'd better take my time and browse through all the topics.
I now starts to love rocking things. I even take out an old ornamental toy from is box and begin to play with it. Actually it was a gift to my mom from her students, which had been neglected by me for many years and just laid at the conner of the bookshelf unwrapped. I am now really enjoy watching it rock. Rocking cats, really lovely isn't it?

The rocking horses are obviously pretty commonly seen on stamps as well as in daily life. What is interesting me now is that why there are not other rocking animals, such as elephant? If I were manufacturer, I would try rocking tigers , lions, camels, bulls, deers, pandas or even mythical animal like dragons and phoenix. So I think perhaps horses have special implications in your cultures. Anyway, it's great to see the toys and games of children. It's kinda like bringing people back to childhood by browsing through the stamps and it's also interesting to see the similarities and differnces between cultures and regions, and I plan to post more stamps to that thread on Chinese toys.
The rocking chairs seems pretty seldom depicted on stamps, but I am still feeling enthusiastic to dig a little further into the topic, and have some interesting discoveiess around them, like JFK's rocker and Linchon's rocker.
This JFK's rocker, which is donated to the White House by JFK family, makes me come to understand what you mean when you say almost fall over on your mother-in-law 's chair. :-) But I suppose it must be a cherishable memory, and will surely become a nice story you can tell your children in the future.
And I even begin to probe into Rock'n'Roll music a little bit. But I just cannot understand why it is call that name. It seems to me that the word generally relates to slow and relaxed things, but the music seems just on the contrary. Anyway#65292;it's not urgent, I think I can take my time, just like sitting in a rock chair, and perhaps even better with a pipe like Mark Twain, and letting things get straight and clear with the time. I think this is the spirit of rocking chairs, isn't it?
By the way , the platform rocking chair has a very clever design with its own tracks installed, which surely prevents grooves in the floor boards and carpets. This feature is a lot alike Scherzer's bridge's tracks. I guess maybe Mr. Scherzer invents his efficient bridge when he was rocking on such a chair! :-)
Cheers!