Once, while I was seated next to a glass partition in a MTR train, there stood two little girls leaning against it. They were so short that their tiny ponytailed heads were on the same level as mine. One girl patted her left shoulder gently, and the other obediently leaned her head on the first girl's shoulder.

At that instant, I wondered whimsically if I should lean my head on the glass partition, so we three could have had a mind meld.