This activity is a good way to have children to be engaging, hands on and thinking like a mathematician. Also, it shows the students the process that real mathematician go through a similar process when discovering new shapes. It is a way to introduce visual learns to bridge to analysis learners. You are visually looking at the shape but you are also gaining an understanding of the properties of the shapes and what they mean. Additionally, they get to see how one shape can be many different figures but has the same qualities and classifications!
Also with this activity you can have the students to explain their thinking. If you do a Venn diagram plan where one circle is empty and have them explain why it is empty but has some of the same qualities that both circles share. Maybe the shapes do not have anything in common you can ask why is the middle circle is empty to see if they are understanding the concepts.
There are also other activities you can do other than the Venn diagram. You can have the shapes on cards with the cards having the shapes in different sizes, orientation, shading and forms and you can play card games with them. One card game that is good to play is Go Fish. When you play go fish the students are also transiting to analysis learners because they have to be specific and precise with the properties they are asking for to match the cards up. Also, this game is great because you are making associations with what certain properties are saying and seeing what it looks like.
The next thing that would be for activities for deeper understanding of properties and shapes is to give students the shape cards. Allows them to come up with their own games with their own rules that everyone agrees to. It boosts their creativity, allows them to completely engage in the activity and gives them an incentive of playing the game that they created themselves. Once they see that the game works they have to write down the rules and how to play and they get to switch with other groups to try all of them out. Yes, this will take time, but students are still learning and reinforcing the concepts that are being taught. Having activities like this will allow them to find a new enjoyment for math.