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Stomper PLH spotted two figures clad in vibrant clothing at HarbourFront MRT Station at 2.05pm on Friday (May 18).
In photos contributed by PLH, a group of people in white could be seen walking alongside the two figures in the train station.
The Stomper described their heads as being "twice the size of an average human being".
PLH said: "I saw them during lunch time.
"They were taking the train instead of hiring transport.
"It must be quite heavy.