Zac Cannon, high school teacher from Memphis TN, uses the 2×4 chair plans for the his class.
Zac teaches Precalculus and he is currently working on PBL (Project Based Learning) scenario for his class. This is part of the STEM (Science Technology Engineering Mathematics) initiative. The students need to be able to give all the missing measurements on the angular cut pieces from your 2X4 chair. They will use their trig skills and law of sines.
Zac found me via the Facebook page. I was excited to see this use of the plans. Maybe one day, when the school has the possibilities, the students can build the chairs and sell them as a fundraiser for the school.