This particular bean is growing in a lump of potting soil placed in a bit of plastic wrap, the bean placed in the soil at the plastic wrap, then put into a cup. The scientist can lift the plastic wrapped soil out of the cup and see the root development at any time, and the plant can grow somewhat naturally.
I was asked to help document the progress of our intrepid bean, and this particular photo looked interesting with the combination of textures captured on that windowsill.