That image to the right is Clark's dojang, sometimes referred to as a "chop." It is a personal stamp, as good as a signature on any official document, and the use of such seals was once widespread across China, Korea and Japan. Chops are a bit of a relic these days in East Asia, but they are still common enough that you can roll them up in Katamari (they're labelled under the Japanese word, hanko, and are usually found near an inkpad.)
Through Rhonda's many connections among other adoptive families, we placed an order to have one made and sent to us. The actual dojang is the bit in red; the light green portion is the sample display card and presumably contains the mark of the vendor who made the chop. Probably says "thank you for your business" or something! The Hangul characters in the center spell out Clark's Korean name. The stamp itself is a hand-carved wooden cylinder, about four inches tall. The carving shows a tiger in a bamboo forest and it is just as cool as you could imagine.
One thing I forgot to mention about my day off with Clark... I was playing the PaRappa soundtrack because I rightly guessed it would amuse him. During the first rap - Chop Chop Master Onion's rap - I would act out the motions while holding him. Kicking, punching, ducking, posing, etc. He giggled so hard that we of course had to run through it several times. And I have been in severe leg pain ever since. Before Clark came home, I was doing 75 sit-ups a night. Now that he's here, I can barely high-kick it through a martial arts rap.
Good job, PaRappa. You can move on to the next stage now...