The cubes similar in size are put together as in the side picture.When looking at it from the left,the right,or from in front and behind,we can see that they look the same.How many cubes are there alto...

We have:

1 cube on the top (1)

5 cubes at the middle (2)

5 cubes at the bottom to place up the 5 cubes at the middle (3)

Along the 5 cubes at the bottom, we got 4 cubes placed at the middle of each 2 cubes (4)

And the outside, we have 8 cubes placed equidistant (5)

Add (1), (2), (3), (4), (5) total we got 1 + 5 + 5 + 4 + 8 = 23 cubes