This classic 2×2 brick – or code 300321 to call him by his full name – is a bright little number that can go with every occasion. Building a Lego car and need a makeshift bonnet? He’s your man. Building a Lego car and need a makeshift boot? He is also your man. The Claude Makélélé of Lego bricks – you never quite realise how important he is until you lose him down the back of the sofa.