Here is another view of the apparatus that better shows the difference in width between the two platforms. It also gives you an idea of how the top platform and the bottom platform are wedged into the taller, middle tube on the end.
And a view from the other side shows the hole cut in the bottom of the larger tube. Again, that provides an outlet for the sand the children WILL feel compelled to pour into the tube.
It is useful to analyze this apparatus in terms of the dimensions and elements listed in the right-hand column of the blog. Number one talks about orientation. This apparatus actually has two orientations on which the children operate. The platforms are horizontal and the tubes are vertical. Number two states that levels are important to children to understand space. In this apparatus, there are at least three levels: the top platform, the bottom platform, and the bottom of the table. Number three talks about spaces that are open or closed. This apparatus is a very open and airy. Number four talks about creating spaces. The apparatus creates many spaces over, under, around and through. Number five states that children need to put things in holes. This apparatus has two types of holes: the small holes of the pegboard and the larger holes of the tubes.
The purpose of analyzing is to see how complex the space is. The space is only complex upon analysis. What a child sees is an inviting place on which to operate. More complex spaces foster a larger variety of operations that are both more complex and are particular to the apparatus.
Children can operate on spaces that are on different vertical and horizontal planes---all at the same time.
The simple act of scooping sand from the bottom of the table now becomes an exercise in working around obstacles and barriers.
The simple act of pouring is becomes a cascade to follow with your eyes and feel with your hands.
Pouring through two Platforms from Thomas Bedard on Vimeo.
And some operations are fostered directly by the apparatus. For example, a horizontal plane promotes a different type of operation than a vertical plane.
Rubbing the Platform with a Tin Cup from Thomas Bedard on Vimeo.
Children do not shy away from complexity if they can physically explore it. For them it is a stage for experimentation that frame a continuing sense of wonder.