Focus stacking with 4 photo's. Lining them up was quite a hassle, since in their bottoms there is ball-bearing to have them move across a flat surface.
@365projectorgchristine I took 4 photo's, with different focus points: one on the front row, the next on the second row and also on the third and fourth row. You can combine them automatically in Photoshop, which takes only the sharp parts of the different photo's, So you get more depth of field than while the background will still remain blurred.