Disability in part results when the shape of the world—buildings and streets but also institutions, cultural organizations, centers of power—operates rigidly, with a brittle and scripted sense of what a body does or does not do, how it moves and organizes its world.

but the mathematical envelope, which is defined as “the locus of the ultimate intersections of consecutive curves.”

Kunal’s thoughts on qualifying tweets outside your normal “realm” with “off topic” (the bookmarked tweet being an example). Don’t think it’s necessary at all, but also understand why people do it. If you know/believe that people are following you for a specific reason, then understandable [to] qualify it. Some people use Twitter to exist as full people—all things they are interested in and care about are fair game. Others are much more focused on a specific passion or something that aligns with their career. FWIW, I prefer the former kind of person in almost every case. The same drumbeat gets boring after a while.