I mentioned Legos elsewhere and remembered watching a video about Lego-style hempcrete blocks, which freebeard mentioned
here.
Matt Ferrell explained it here:
Oddly, while he calls his channel "Undecided," he definitely presented more positives than negatives.
Here is the most popular video about hemp blocks:
I keep trying to find a video showing construction with those blocks, but instead I keep finding videos with a competitor.
Instead of having a resin core making it look and act like Legos, it is like an Oreo, with the filling being the same size, just offset, but then they reinforce it with rebar and concrete.
Even though I searched for "Justbiofiber," YouTube showed me this Jo-Blox video instead, although I couldn't tell by the thumbnail that it wasn't what I specified!