Despite widespread online efforts, no one could figure out what these are.

Lincoln Logs are a classic vintage construction toy made of interlocking wooden pieces that let children build cabin-style structures. Their appeal comes from being simple, hands-on, and highly creative, while also teaching basic building concepts.

Invention and Introduction (1916)

Lincoln Logs were created in 1916 by John Lloyd Wright.
John Lloyd Wright was the son of famed architect Frank Lloyd Wright.
He developed the toy after being inspired by log cabin construction designs he encountered during his travels.
His goal was to create wooden pieces that could lock together and simulate real log cabin building.