Here you can create various objects provided you have enough of the right ingredients.
At the top you will see what elements you have managed to collect.
The 8 buttons at the bottom are like bookmarks for the different formulas you've created so you don't have to redo them.
You create a formula by clicking on one of the elements one or more times.
Each time you click the same element you add the amount you want.
Clicking the element inside the formula display will remove it from the equation.

Hover over the interface for details.

Place objects here to see what they are made of.