Step 23

Merge all layers with cubes in the one group (select layers and press Cmd /Ctrl+ G or Layer > Group Layers... ). Now time for the white cubes. This time I used the cubes 7 and 10. You can duplicate any "cubes 7", and then change the size, but rather will have to add cubes 10 (File > Place (Place Embedded...)). First, duplicate (Cmd /Ctrl+ J) "cubes 7" 3 times. And combine them into one group. The group must be located on the Layers panel as shown in Figure.

At once make them white add adjustment layer "Invert" (Layer > New Adjustment Layer > Invert...). This adjustment layer must be applied only to a group with duplication cubes, not to the whole document! Now you can begin to change their size and location. Try to do as I have shown. Location of white cubes in a group does not matter much, but very important to position the layers with black cubes.

This is my result.

Step 24

Now you need to paint background, to building not shown through behind the cubes. To do this, create a new layer (Cmd /Ctrl+ Shift + N or use icon on Layers panel). Place this layer below group with cubes. Select a Brush tool (B) (Size: 300px, Opacity: 100% - 50%, Hardness: 0%). Use Black color.

Paint the background and a bit under the cubes (you can hide group with cubes on a time by clicking the eye icon next).

Step 25

I wanted to create the effect of depth and cracks on a white floor, so I added image "34 C4d By TomSimpsonTS" from "C4d Pack 3 By TomSimpsonTS". Now we will change it a bit that it was suitable for our art. To begin, duplicate it once (Cmd /Ctrl+ J).

Select both layers and change the blending mode for them to "Multiply". Add to each layer adjustment layer "Invert" (Layer > New Adjustment Layer > Invert...). Now they have become dark, and the background is gone.

Step 26

You can begin to transform (Ctrl/Cmd+ T). Reduce the size and rotate so that they are along the lines of white and floor were directed roughly to the center. Transform each layer separately. Place these two abstractions as shown in the figure. They have just a little peek out from under the cubes.

Add a layer mask to this group and use a Brush Tool (B) to remove of the abstraction that are imposed on the city, anything above cubes.

Step 27

Begin to create a floor. We draw it yourself. Create a new layer (Cmd /Ctrl+ Shift + N). Fill it white color (D then Cmd/Ctrl + Del).

Take a Gradient Tool (G), set the type of gradient: "Foreground to Transparent" and Radial form, Opacity: 50%. Set Foreground color to Black (X) and draw a spot from the center to the left edge of the document.

Step 28

And now you will learn how to make the effect of extrusion of cubes :) First, convert layer for Smart Filters (Filter > Convert for Smart Filters) and apply filter "Extrude" (Filter > Stylize > Extrude...). Make settings like shown in the image below. Be sure to check the box on "Mask Incomplete Blocks".

Move texture (use Move Tool (V)) so that its center was slightly lower (as the floor seems much volumetric). Add a layer mask to this layer. Use a Brush tool (B) to remove texture from the sky, city and under abstractions. Do not make a sharp transition of the texture. Little to hide it from the edges to create one effect transparent and dynamic floor.