My sis described him cheekily as “a boy with obsessive compulsive disorder with order”.
Compared to his parents who are definitely not the neatest folks in the world and often bordering on sluggish/ slackish, Jingheng likes neat and clean, i.e. straight lines and no mess-on-my-fingers please!
One of his fav activities now – Line up you toys! (Ooh, what a wonderfully-Singaporean trait in development)