The world expects us as humans to interact as fully functional 3D manipulators who can observe, manipulate, and act in three spatial dimensions. Ableism defaults people with the assumption that disabled people are inferior at manipulation, imagining, and navigating the world. Our experiences and the narratives we integrate from other disabled people speak to this as limited imagination and consideration. In this theoretical contribution, we go over the normative dimensional assumptions built into our environment and media and analyze the consequences of ableism in how spaces — digital, physical, imaginary — operate in how we think about the material and virtual world. We situate this ableism against disability-led technology design and disability futurity that imagines a very different world of space, manipulation, and possibility.