crosswindows  I could have made it from one color of wood but... i just couldnt .....  
size  .......resist the beauty of it.  
crosswindowszebra  Actually i can make this puzzle with different woods on each cross window but it will give clues to solution,so.... 
crosswindows zebra side  .....unless you ask me for that ,i will continue making the combinations that you see. 
sliding  sliding axis is in all sides, here is one