I didn’t actually make one of these toys myself, but if you’re handy (or have a really handy husband), this is really a great toy. J got to play with this on a recent trip to a children’s museum.
They had two peg boards standing across from each other and with a tray of short, long, t-shaped, and corner pipes. I have no clue what their technical names are! All J had to do was fit the pipes together to build. I was surprised how well he did with this. I did have to point out the size of the pipe holes since you had to place one of the connectors in between the straight pipes. He had a hard time remembering that.
Age attempted: 23 months; a younger toddler could easily fill the holes with individual pipe pieces instead of attempting to extend the pipes from wall to wall
Teachable Moments: ask them to send the pipes up/down, requires an understanding of patterns to do this on their own (rotate between straight pipes and connectors)
Try Again? Not at home, I can’t see us buying the pipes/peg boards nor do I want to store them it could work in a garage. He’ll have to wait till we visit the children’s museum again!

I am curious which children’s museum this was. Thank you
The museum with the pipe building was near Orlando. They had floors for toddlers/preschoolers and floors for school-age kids. This activity was in the science section for older kids, but J managed it really well after I explained how they worked.