This problem involves analyzing a structure made of blocks and answering questions related to its geometry and properties. Let me break this problem down:

Questions:

1. Type of Symmetry (Q1):

   • Analyze the type of symmetry present in the structure.
   • The structure exhibits vertical symmetry as it can be divided into two mirror-image halves along the vertical axis passing through the middle.

2. Number of Blocks Used (Q2):

   • Count the total number of blocks used in the entire structure.
   • The total count = $20$.

3. Number of Blocks in Lower Rows and their Alignment (Q3):

   • Count the blocks in the lower two rows and analyze how they align.
   • Bottommost row has $12$ blocks, and the second row from the bottom has $8$ blocks.

Would you like further details, visualizations, or mathematical breakdowns of the structure? Let me know! Here's how you can explore further:

1. What is rotational symmetry? Does this structure have any?
2. How many blocks would be needed if this structure were extended symmetrically horizontally?
3. What is the total perimeter formed by the outer blocks of this structure?
4. If each block is of unit size, calculate the area covered by the structure.
5. How many blocks would be removed if one vertical layer were erased?

Tip: Always analyze structures geometrically to find symmetry and total counts efficiently.