It's called "From the Stacks: Highlights of the National Library", and showcases the best of the library's many years of collections!
They range from WWII comics, the Malaya/Singapore newspapers, maps of harbours, and my personal favourite: the letters of Raffles.
Here are some pics! (They're all from the letters of Raffles section. I'm bias as always)
I highly recommend a visit! It runs till 28 August, so lots of time to go! In fact, I'm definitely going back again!