These artworks are no longer in public places, at least as far as we know. In some cases they still exist, but have been removed to private spaces.
1974
Musical Fountain
Tan Teng Keefirst placed in front of Plaza Singapura, at its launch. Later moved to Marina Bay, later destroyed.
1979
Athletes in Action
Joseph McNallyCurrently not publically accessible, in the HDB offices
1986
Fertile Crescent
Ramon Orlinaformerly near National Stadium, facing Kallang Basin
1986
Wings of Victory
Ramon Orlina“one day it magically disappeared” in the words of the artist
1987
Temu-sek
Chong Fah Cheongrelocated from Somerset MRT in 2008 to the SMRT Sports and Recreation Club in Bishan
1987
Surprising Singapore
Leo Hee TongBuilt outside the Orchard MRT station, now the site of Ion Orchard
1990
Breakthrough
Chern Lian Shanonce infront of the NTUC HQ on Bras Basah Rd
1994
Rainbow
Chern Lian ShanRemoved from its location near One George St. Presumably destroyed.
1999
The Explorer
Ng Eng Tengfirst placed in front of the Singapore Art Museum, later moved to a side garden. Has turned up at the Singapore Science Centre (2022), but that is meant to be renovated soon, so not sure how long it will be there…
2002
Millennium
Victor Tanremoved in the 2015 (?) renovation of the Asian Civilisations Museum that saw the introduction of the Shipwreck Gallery