Design a visually captivating promotional poster with a top-to-bottom split, highlighting the nostalgic clash between the 90s and the 00s.  The top half, representing the 90s, is awash in bold colors like lime green, purple, and hot pink. This section features lifelike objects such as a Game Boy, a Tamagotchi, and a pair of chunky sneakers. The background includes a grunge-style brick wall with posters of iconic 90s bands, graffiti tags, and early internet elements like pixelated icons and a dial-up modem screen. A stack of CDs and a boombox add to the retro vibe, evoking the era’s mix of analog and digital culture.  The bottom half transitions into the 00s, dominated by sleek metallic tones, digital blues, and glossy whites. Realistic elements like an iPod with white earbuds, a flip phone, a stack of DVDs, and a Windows XP desktop screen are set against a backdrop of early social media logos, like MySpace and the original Facebook, along with the blue glow of a CRT monitor. A slim, metallic laptop and a pair of low-rise jeans draped over a swivel chair hint at the era’s tech boom and fashion trends.  In the center, where the two decades meet, the title '90s vs 00s' is displayed in a sleek, futuristic font, with the top half of the letters reflecting the grunge textures of the 90s and the bottom half showcasing the glossy, digital aesthetic of the 00s. The transition between the two halves is a smooth gradient, with elements from each era subtly overlapping, creating a dynamic and nostalgic visual experience that draws viewers into the cultural shift from analog to digital.