Because the cuts are made across the board the end grain is exposed on the face of the tile just.
How to make a floor from 2x4 ends.
To make a layout with the least cuts on wood tiles you can dry lay the tile.
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Cut the 2 x4 or 4 x6 in 3 4 or 1 slices.
Also called wood block flooring end grain floors are made of tiles cut from timber ends.
X research source alternatively you can fashion your own block supports by cutting 4 in 10 cm x 4 in 10 cm boards into 16 in 41 cm sections to fit in between the joists.
Sand them lightly placed them down in whatever pattern you desire and then trowel fill the spaces with glitsa wood flour fill let it dry.
If your floors are 15 feet 4 6 m long for example you would position a brace 5 feet 1 5 m from either end.
This means just placing the tiles without mortar or permanent adhesives.
Use a heavy bed of bostic best adhesive 25 feet per gallon to act as moisture barrier and glue.