The gallery showing these says:
Drawings of Old Trees during the wintry days 2007-2014 are not renderings of actual trees, but are inspired by the trees in Belgium, particularly those in the artist's own garden. The drawings evolved organically from Van Caeckenbergh's imagination after having observed the trees for so long that he was able to absorb their form and essence. Caeckenbergh often revisited and reworked the drawings over a number of years, laying new pieces of paper over some sections so he can expand on them, never erasing his marks. The drawings have some playful references-sometimes elements of the tree are shaped anthropomorphically, on occasion small windows or doors are worked into roots. Van Caeckenbergh views these tree drawings as a metaphor for his overall practice, the branching off of ideas and concepts from one central source.