Designing outdoor furniture that generates holographic universes is a groundbreaking fusion of art, technology, and innovation. To achieve this, start by integrating augmented reality (AR) technology into the furniture's structure. Use transparent or reflective materials like tempered glass or polished metal to serve as surfaces for holographic projections. Embed motion sensors and micro-projectors to create interactive, dynamic holograms that respond to user movement.

Next, focus on the software aspect. Develop or collaborate with AR platforms to design customizable holographic universes, allowing users to switch between themes—such as cosmic landscapes or underwater worlds. Ensure the furniture is weather-resistant and energy-efficient, possibly incorporating solar panels to power the holographic displays.

Finally, blend aesthetics with functionality. The furniture should be visually striking even when inactive, with sleek, minimalist designs that complement modern outdoor spaces. By combining advanced technology with creative design, you can transform ordinary outdoor furniture into a portal to immersive holographic experiences.