Giant balls of twine, complex tunnel systems and integrated scratching posts are some of the features on offer in this series of deluxe architect-designed cat houses created by Los Angeles architects for a charitable auction.

Architects for Animals, a local charity, uses the Giving Shelter fundraiser to collect donations and support services for help feral, stray and abandoned cats in a city with an estimated 3,000,000 such animals.

This is the tenth annual such competition, and each year draws in some of the world’s largest and most famous local and global architects and firms, including Perkins + Will, HOK, HKS, D3 and more.

Some of the dwellings are experiential, featuring shiny toys, ramps, tubes, beds and slots fit for feline friends, while others explore architectural trends, like living moss walls and flat-pack and modular design strategies.

Previous years of the program have featured Brutalist, Modern, Postmodern, Deconstructivist (and more difficult to classify) habitats crafted with metal, concrete, wood and other architectural materials.