There is no apparatus to build. This is just a 5 gallon pail that I retrieved from the cafeteria in the school. I set it next to the table; I do not attach it. Children are free to move it---or dare I say, transport it---around the table.
But it doesn't have to be a 5 gallon bucket. It could be a waste basket.
The tub above is actually part of a cardboard chute apparatus, but it works in accordance with Axiom #1. When they are not using the cardboard chute, they will still transport the medium directly into the tub---or try to transport it out of the tub.
And even if you have a tub, you will still want to provide an unattached pail or bucket.
In the picture above, water has already been transported into the tub from the table through a tube apparatus. The child is now transporting the water from the tub to the bucket. Transporting once removed!
And don't overlook the possibility that the child will use the bucket to transport the medium back into the table.
In the first video, the child scoops some pellets from the sensory table and dumps them on the floor. I am nearby, so I push the bucket so it is right next to him and tell him to "put it in the bucket." Watch what happens.
With the bucket handy, I simply request that he puts it in the bucket. Remember, he has an innate drive to transport the pellets. I have just given him a constructive alternative which he willingly takes advantage off. That's a win-win.
So what happens once he has found the bucket? Watch.
As he starts scooping from the bucket, he now has more choices to transport. He scoops from the bucket and drops it back in the bucket; he scoops from the bucket and puts it back into the table. He can also scoop from the table and drop it somewhere else in the table; he can scoop from the table and drop it in the bucket. So many choices and all constructive.
Here is one more video illustrating how I redirect a child to "put it in the bucket." The little girl takes some sand from the sensory table. She puts some of it in the bucket because she knows she can transport it into the bucket. However, she does not dump all the sand in the bucket and starts to walk away with some still in her hand. Watch what happens.
As she was walking away, I ask her to put it in the bucket. She stops, turns around, and puts some more in the bucket. She looks up at me as if to ask if it is enough. I ask her to put it all in the bucket. And she does.
I know children need to transport. Instead of expending a lot of negative energy in an effort to keep the medium in the table and off the floor, I set up constructive avenues for them to transport any medium out of the table and back into the table. As a consequence, all my communication is simple, direct, and positive.
I also know that when they transport, they will spill (Corollary to Axiom #1) . I do try to minimize the spilling, but I won't get bent out of shape if it happens. Life is too short and there is too much living to do when you are surrounded by the boundless energy and imagination of young children.