Hadley video: Finding things you've dropped

Hadley has a series of workshops titled "Basic O&M" (orientation and mobility), but sounds as if it could be useful to lots of folks, the most recent video titled "Finding Things You've Dropped." Look down the page and you will find other workshops in the series, such as one on preventing falls.
https://hadley.edu/workshops/o-m-basics-series/finding-things-you-ve-dropped

Blind rock climber from Boston uses Legos to map wall

I don't really get how the Legos are being used to map out the wall but, between this and the man who uses Legos to build his prosthetic arms, Legos definitely count as assistive technology
https://www.bbc.com/news/av/world-us-canada-54171777