Sorting is done by joining with similar shapes.

Explanation:

Sorting refers to the process of arranging items in a particular order or grouping them based on certain criteria. One of the ways to sort items is by joining them with similar shapes. This means that items that have similar shapes are grouped together. For example, if we have a collection of different colored circles, we can sort them by joining all the circles of the same color together.

The process of sorting by joining with similar shapes involves the following steps:

1. Identify the shapes: The first step is to identify the shapes of the items that need to be sorted. In our example, the shapes are circles.

2. Group the items: The next step is to group the items based on their shapes. This means that all the circles are grouped together.

3. Arrange the groups: Once the items are grouped based on their shapes, they need to be arranged in a particular order. This could be based on color, size, or any other criteria.

4. Label the groups: Finally, the groups need to be labeled so that they can be easily identified. In our example, we can label the groups as 'red circles', 'blue circles', 'green circles', etc.

By sorting items based on their shapes, we can easily identify patterns and similarities among them. This can be useful in various fields such as mathematics, science, and art.