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*SPOILER ALERT - IF YOU'RE GOING TO TAKE THE TEST YOU MAY WANT TO SKIP THIS AS IT HAS INFORMATION ABOUT THE SHAPES*
A couple of things I noticed while taking the test:
First, the black shapes leave a white(ish) afterimage against the grey background (at least in my vision), and this occasionally helped me to guess correctly. The afterimage didn't last quite long enough to see all of the shapes clearly when the new shape appeared, but they did allow me to determine when the new shape was different in size than the old one.
Second, the "bomb" shape was far and away the easiest one for me to remember because my brain so clearly identified it as a bomb. Too many 8-bit video games, I guess.