Answer:
Maybe light plastic, like a lego.(temporarily) If it was bigger though, it'd sink
Step-by-step explanation:
Most Lego bricks are made of ABS plastic which has a specific gravity greater than 1 (but only slightly). So, they are heavier than water and will not float naturally. You can get small bricks to float initially since small bubbles cling to their surface, but they will all sink eventually.