THE POWER OF SUN
At this point, we find ourselves in the middle of the desert. Our mission is to install 17 solar panels by clicking on the ground. The solar panel model is not present in CoSpaces gallery so we loaded it from Google Poly (unfortunately this option is no longer available because Google site closed; however, there are many other possibilities to find and import free 3D models). The problem is to set, at first, the opacity of all 17 models to 0 in order to be not visible but clickable. We listed them one by one but then we discovered the “for” function. We repeated this operation 17 times storing them within the variable “panel”, which contained “get item" block, the concatenation of the “Solar Battery” string plus the variable “i” that was incremented. We have thus saved a large number of blocks! We learned an important rule: programmers are lazy! 
