DIY Sand and Rock Box by FSPDT. Gdjk -> made this with toilet rolls (aka tunnels) and moon sand instead of play sand. My son loved playing with it. The moon sand cleans up nicely indoors but play sand will be easier to play with when using the small cars.
I chose this picture because I think having a construction area is important and fun, and this one includes pictures of the students. The pictures create a sense of community and a feeling of belonging.