Reuben's incredible memory for signs

Windy, clouds - these are words I haven't used (or had to use) since August in the UK and since yesterday was an incredibly windy day so that the garden table parasol finally had to come down, I said the word along with lightning, leaf and other words in our Nature signing vocabularly (Reuben knows every sign I know) and Reuben signed back without hesitation, windy, clouds, lightning, leaf. I find such accurate expression in sign language simply beautiful, most especially since he's not seeing such signs on a daily basis to aid recall, as he would be with other commonly spoken words in a hot desert climate.