Reference to another sheet

Hi,
I have a matrix of values in my first sheet "Tabelle1". In my second sheet "Tabelle2", some underlying function returns a value such as "A4", "B2", "F6", etc. I want to use this value in order to make a cell reference in my second sheet "Tabelle2" to the resprective cell, such as "A4", "B2", "F6" in my first sheet "Tabelle1".
Attached you can find an example. In "Tabelle2", I want to use the value "A4" in cell A1 to make in cell C1 to cell A4 in sheet "Tabelle1".
Does anyone has an idea how to do that?

In the example above, I would like to see the value from cell Tabelle1!A4, i.e. 4. However, A4 is not fixed and depends on the value from cell A1 in Tabelle2

Thanks Alan, the indirect function was the right hint. Together with the concatenate function, I got now what I wanted to have