Redline (2009) is Takeshi Koike's seven-years-in-the-making animated racing film for Madhouse studio, hand-drawn across more than 100,000 cels with zero CG assist. Its visual language fuses American hot-rod pinstriping and pop-art poster graphics with the raw psychedelia of 1970s rock-concert flyers, all rendered in flat screenprint-style fluorescent fills locked behind hard black keylines. Every frame sits on an ink-black ground, never a neutral studio white — shadow is treated as mass, not gradient, and racing-red and chrome-yellow detonate against it like blacklight poster ink. The result is a maximalist, kinetic, diagonal-driven aesthetic built for speed, impact, and unapologetic oversaturation.