Seeing what is ˇin common: Suppose I show someone various a coloured pictures comic and say,: “The colour which you see in all of them these pictures is called ‘ochre’.” – Th[at|is] is an expllanation explanation which the other person is underst[an|oo]ds when he looks and sees by finding what ˇit is ˇthat's in common to th[o|e]se pictures. He can then
look
gaze
at what is this commonˇ element, or point to it.
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to it.

      Compare with th[at|is]: – I show him
polygons
rectangles
of various shapes, all painted with in the same co[k|l]our, and say, : “What th[i|e]se have in common with one another is called ‘ochre’”. –
      And compare with th[at|is]: – I show him samples of various shades of blue and say, : “The colour which is common to ˇthem all I call ‘blue’”.