Nick Clegg called the Liberal Democrat manifesto "an insurance policy against a government lurching off to the extremes" after the election.
The Lib Dems have pledged to increase funding for education from "cradle to college", which they claim will mean spending £5 billion a year more than the Tories and £2.5 billion more than Labour by 2020.
The Liberal Democrats' unusual choice of backdrop distracted some Twitter users from the party's manifesto policies today.
Many compared the brightly coloured handprints and neon lights surrounding Nick Clegg to a "disco" as he delivered his speech in Battersea, south London.
A ComRes/ITV News poll suggests a huge fall in support for the party in its south-west "heartland" - with the Tories benefiting most.
The manifesto launch was held in a "creative space", a bit like a trendy bar. But this is serious stuff though.
The Lib Dem 'cradle to college' pledge and theme of "opportunity" is one of of five policies featured on the front of the party's manifesto.