A large topic but very rich and may-be the start of a new project next year?
![](/files/collabspace/3/63/863/74863/images/c311b90de_opt.jpg)
left picture right picture
3d in reality: The High Trestle Trail Bridge in Iowa (US)
The picture left shows the High Trestle Trail Bridge (Iowa, US) - in realty a wonderful 3d object. the picture at the right is the plan of the bridge- in 2d . this could be modeled with GeoGebra or with Scratch.
project: 3d objects (Cro)