Things With Actual Uses

Hello all,

I have been thinking on the possibility of collaboration during the design and creation of physical products. When I look at Open Source Software projects, multiple developers can contribute to a single project which possibly ends up with a finer result. But when it comes to creating physical products, collaboration stays in the background. (Only small contributions by remixing completed projects) I wonder your opinions on why contribution on each others' work is very limited in the development of physical products.

Me, at the moment I am printing off batches of bookmarks which are given away to kids via my local library

Me, at the moment I am printing off batches of bookmarks which are given away to kids via my local library

Me, at the moment I am printing off batches of bookmarks which are given away to kids via my local library

Me, at the moment I am printing off batches of bookmarks which are given away to kids via my local library