This year I added a wooden tray to the apparatus. The tray connects the blue water table with another small water table.
The children used the addition of the tray for two main purposes. The first was to hold containers on a different level and to pour and mix into and out of those containers.
The second purpose was to hold the suds the children created. One group got really close to filling the tray with suds.
That amount of suds encouraged some in the group to experience the suds using their sense of smell.
One facet of the sponge is that it fosters physical exploration by the children. Watch the video below to see how the children physically examine the sponges.
As you just saw, the physical exploration including squeezing a small sponge hard, smacking a small sponge on the bottom of the pail, pressing down hard on the big sponge and hand pummeling the big sponge with force.
Here is another instance of physical exploration by the children. In the video below the two children have filled a five gallon pail full of suds. One of the boys decides it is time to dump it. The other boy is all in and even helps to get suds out with his spoon. If you watch to the end you will see the excitement of the venture is palpable.