have some small bonzai pots with plants in them that stand on a south facing
window ledge. The window ledge itself has a shiny tiled surface.

the pots stand on small ceramic saucers. these saucers do not leak water.
(one is glazed on its top surface so cannot leak ). but there always seems
lots of wet underneath them. is this some kind of condensation? or how
would it get formed ? thanks