A technique of gently integrating a whipped mixture with additional ingredients while preserving its airiness is known as folding. This method is utilized for blending meringues, soufflés, and certain types of cake mixtures. A typical example of this technique is the process of folding dry flour into a beaten sponge cake mixture. Firstly, the flour is sifted over the whipped mixture, and then a large metal spoon is used to scoop up a spoonful of the sponge mixture from the bottom of the bowl. The spoon is then drawn across the base before being folded over the top, enclosing the dry flour in between. This process is repeated until all the flour is combined, periodically slicing through the mixture with the spoon held at a right angle to the direction of the folding.