My original concept for Rainbow Tower was developed in Lego Digital Designer, with colourful balconies and transparent curved pieces for windows above. But when I came to order the parts, I discovered – to my horror – that the key piece I wanted – 6091 – is not made in trans clear! My build was impossible. And I was do disappointed. So I left the idea to fester on my hard drive. Eventually I acquired some white vehicle mudguards, part 41854 in white, and a selection of rainbow coloured bricks and I put together this block instead.