When sisters Wong Shi Yun and Shi Li joined Deloitte Singapore as interns in December 2010, colleagues in the auditing firm did a double-take.
From their bangs to their slight frame - Shi Yun, at 163cm, is just 6cm taller - the 24-year-old identical twins look like two peas in a pod. They became audit associates in the company in September last year.
Says Shi Li, who is the younger by two minutes: "Twins are not that common and to top it off, twins working in the same company?"
Her observation is not wrong. Figures from the Report on Registration of Births and Deaths 2012, show that of the 42,663 babies born here last year, there were 1,121 twin births.
Little wonder, she says, they were initially deluged with questions such as "Who is the older one?", "Do you have any telepathy?" and "Did you ever try to trick friends into thinking you're the other twin?"
Shi Yun, who is usually the first to answer questions, says: "I normally tell them we are not that alike in appearance actually and that people can tell us apart because Shi Li is slightly smaller."
Still, people get confused, not least because the twins have a habit of chiming in together, saying things such as "Oh, yes" or "We think so".
The sisters live with their mum Alice Kay, 57, a housewife, in a three-room HDB flat in Bedok. Their father died of a heart attack when they were seven.
Twins interviewed say they share more similarities than dissimilarities. They often go to the same schools, pick the same university, travel together and share the same pool of friends.
While strangers treat them as novelty, do parents treat them as a package deal?
Human resource practitioner Angie Ong says she and her husband unconsciously treated their twin sons Kenneth and Nicholas Chew - now 22 - "as a package" when they were very young.