The point about Polyani

Polyani was in agreement with John Ruskin though at a later date, when he noted that not all human experience is recorded or even communicable in what we can say. For example, please tell me how you can recognize your dog from another in the same litter. You may look for distinguishing marks, or the wag of her tail, but there are points of recognition that defy language to convey, and yet the recognition is immediate. 

"Let the youth once learn to take a straight shaving off a plank, or draw a fine curve without faltering, or lay a brick level in its mortar, and he has learned a multitude of other matters which no lips of man could ever teach him." --John Ruskin, "Time and Tide", 1883

Having routed the parts of the apron, I'm making the stretchers that strengthen the legs of the desk. To do so, I use a small  4-in hand rasp to round the shoulders of the tenons to match the rounded shoulders of the mortises. This is shown in the photos.

Make, fix and create...