Here's a link to the full paper, colloquially known as Lockhart's Lament:
Link: https://www.maa.org/external_archive/devlin/LockhartsLament.pdf
In the context of K-8 learning materials that take into account the concerns discussed in Paul Lockhart's essay A Mathematician's Lament, I wonder if anyone knows of syllabi, curricula, or worksheets that I can use to supplement my child's "Core" program in school, and what experiences (if any) others have with using said materials.