Here's the cup attached to the tree filling with the latex sap.
The cups of latex are then collected in buckets and the latex pour into these containers.
The latex that is left in the cups after pouring out, coagulates and then is collected in the clumps. These clumps are what tires are made from. There are sprayed pink to identify them as from Firestone so people don't steal the clumps and try to sell them.